Exhibit 5.1

April 20, 2021

Axon Enterprise, Inc.

17800 North 85th Street

Scottsdale, Arizona 85255

Re: Registration Statement on Form S-3

Ladies and Gentlemen:

We have acted as counsel to Axon Enterprise, Inc., a Delaware corporation (the “Company”), in connection with the preparation and filing with the Securities and Exchange Commission (the “Commission”) of a Registration Statement on Form S-3 (the “Registration Statement”) pursuant to the Securities Act of 1933, as amended (the “Act”), relating to the registration and the proposed issuance and sale from time to time pursuant to Rule 415 of the General Rules and Regulations of the Commission promulgated under the Act, as set forth in the Registration Statement, the prospectus contained therein (the “Prospectus”) and the supplements to the prospectus referred to therein (each a “Prospectus Supplement”), together or separately and in one or more series (if applicable) of:

● shares of the Company’s common stock, $0.00001 par value per share (the “Common Stock”);

● shares of the Company’s preferred stock, $0.00001 par value per share (the “Preferred Stock”);

● the Company’s senior and subordinated debt securities (the “Debt Securities”);

● warrants for the purchase of Common Stock, Preferred Stock, Debt Securities or any combination thereof (the “Warrants”); and

● units consisting of any combination of Common Stock, Preferred Stock, Debt Securities and Warrants (the “Units”).

This opinion is being furnished in accordance with the requirements of Item 601(b)(5) of Regulation S-K under the Act.

The Common Stock, the Preferred Stock, the Debt Securities, the Warrants, and the Units are collectively referred to herein as the “Securities.” The Securities are to be sold from time to time as set forth in the Registration Statement, the Prospectus contained therein and the Prospectus Supplements. The Debt Securities are to be issued pursuant to a senior debt securities indenture (the “Senior Indenture”) or a subordinated debt securities indenture (the “Subordinated Indenture,” and taken with the Senior Indenture, the “Indentures”), as applicable, both of which have been

filed as exhibits to the Registration Statement and are to be entered into, in each case, between the Company and a trustee to be named in a Prospectus Supplement to the Registration Statement (the “Trustee”). The Securities are to be sold pursuant to a purchase, underwriting, subscription, placement agent or similar agreement in substantially the form to be filed under a Current Report on Form 8-K. The Debt Securities are to be issued in the forms set forth in the Indentures. Each Indenture may be supplemented, as applicable, in connection with the issuance of each such series of Debt Securities, by a supplemental indenture or other appropriate action of the Company creating such series of Debt Securities.

In rendering the opinions stated herein, we have examined and relied upon the following:

(a) the Registration Statement, together with the exhibits filed as a part thereof or incorporated therein by reference;

(b) the Prospectus prepared in connection with the Registration Statement;

(c) an executed copy of a certificate of Jawad A. Ahsan, Chief Financial Officer of the Company, dated as of a recent date (the “Officer’s Certificate”);

(d) the Company’s Amended and Restated Certificate of Incorporation, as amended to date, as certified by the Secretary of State of the State of Delaware as of a recent date;

(e) the Company’s Amended and Restated Bylaws, as currently in effect and as certified pursuant to the Officer’s Certificate;

(f) the forms of Indentures relating to the Debt Securities filed as exhibits to the Registration Statement;

(g) a specimen certificate representing the Common Stock; and

(h) a copy of the resolutions of the Board of Directors of the Company, relating to the registration of the Securities and related matters, as certified pursuant to the Officer’s Certificate.

We have also examined instruments, documents, certificates and records that we have deemed relevant and necessary for the basis of our opinions hereinafter expressed. In such examination, we have assumed: (i) the authenticity of original documents and the genuineness of all signatures; (ii) the conformity to the originals of all documents submitted to us as copies; (iii) the truth, accuracy and completeness of the information, representations and warranties contained in the instruments, documents, certificates and records we have reviewed; (iv) at the time any Securities are sold pursuant to the Registration Statement (the “Relevant Time”), the Registration Statement and any supplements and amendments thereto (including post-effective amendments) will be effective under the Act and will comply with all applicable laws; (v) at the Relevant Time, a Prospectus Supplement will have been prepared and filed with the Commission describing the Securities offered thereby and all related documentation and will comply with all applicable laws; (vi) that the Securities will be issued and sold in compliance with applicable U.S. federal and state securities laws and in the manner stated in the Registration Statement and the applicable Prospectus Supplement; (vii) that a definitive purchase, underwriting, subscription, placement agent or similar agreement with respect to any Securities offered will have been duly authorized

and validly executed and delivered by the Company and the other parties thereto; (viii) that any Securities issuable upon conversion, exchange, redemption or exercise of any Securities being offered (a “Convertible Security”) will be duly authorized, created and, if appropriate, reserved for issuance upon such conversion, exchange, redemption or exercise; (ix) with respect to shares of Common Stock or Preferred Stock offered, that there will be sufficient shares of Common Stock or Preferred Stock authorized under the Company’s organizational documents that are not otherwise reserved for issuance; and (x) the legal capacity of all natural persons. As to any facts material to the opinions expressed herein that were not independently established or verified, we have relied upon oral or written statements and representations of officers and other representatives of the Company.

Based on such examination, we are of the opinion that:

1.With respect to shares of the Common Stock to be sold by the Company, when both: (a) the Board of Directors of the Company or a duly constituted and acting committee thereof (such Board of Directors or committee being hereinafter referred to as the “Board”) has taken all necessary corporate action to approve the issuance and the terms of the offering of the shares of Common Stock and related matters; and (b) certificates representing the shares of the Common Stock have been duly executed, countersigned, registered and delivered or, if issued in book entry form, an appropriate account statement evidencing shares of Common Stock credited to the purchaser’s account maintained with the Company’s transfer agent for Common Stock has been issued by said transfer agent, either (i) in accordance with the applicable definitive purchase, underwriting, subscription, placement agent or similar agreement approved by the Board or (ii) upon the conversion or exercise of any Convertible Security to purchase Common Stock, in accordance with the terms of such Convertible Security or the instrument governing such Convertible Security providing for such conversion or exercise as approved by the Board, in each case upon payment of the consideration therefor provided for therein (not less than the par value of the Common Stock), then the shares of Common Stock will be validly issued, fully paid and nonassessable.

2.With respect to any particular series of shares of Preferred Stock, when both: (a) the Board has taken all necessary corporate action to approve the issuance and terms of the shares of Preferred Stock, the terms of the offering thereof, including the adoption of a certificate of designations relating to such Preferred Stock as required by applicable law (a “Certificate of Designations”) and the filing of the Certificate of Designations as required by applicable law, and related matters; and (b) certificates representing the shares of the Preferred Stock have been duly executed, countersigned, registered and delivered either (i) in accordance with the applicable definitive purchase, underwriting, subscription, placement agent or similar agreement approved by the Board or (ii) upon the conversion or exercise of any Convertible Security to purchase Preferred Stock, in accordance with the terms of such Convertible Security or the instrument governing such Convertible Security providing for such conversion or exercise as approved by the Board, in each case upon payment of the consideration therefor provided for therein (not less than the par value of the Preferred Stock), then the shares of Preferred Stock will be validly issued, fully paid and nonassessable.

3.With respect to Debt Securities to be issued under either the Senior Indenture or Subordinated Indenture, when: (a) the Trustee is qualified to act as Trustee under the Senior Indenture or Subordinated Indenture, as applicable, and the Company has filed respective Form T-1s for the Trustee with the Commission; (b) the Trustee has duly executed and delivered the

Subordinated Indenture or Senior Indenture, as applicable; (c) the Senior Indenture or Subordinated Indenture, as applicable, has been duly authorized and validly executed and delivered by the Company to the Trustee; (d) the Senior Indenture or Subordinated Indenture, as applicable, has been duly qualified under the Trust Indenture Act of 1939, as amended; (e) the Board has taken all necessary corporate action to approve the issuance and terms of such Debt Securities, the terms of the offering thereof and related matters; and (f) such Debt Securities have been duly executed, authenticated, issued and delivered in accordance with the provisions of the Senior Indenture or Subordinated Indenture, as applicable, and the applicable definitive purchase, underwriting, subscription, placement agent or similar agreement approved by the Board, or upon the exercise of Convertible Securities to purchase Debt Securities, upon payment of the consideration therefor provided for therein, then such Debt Securities will constitute valid and binding obligations of the Company, enforceable against the Company in accordance with their terms, and entitled to the benefits of the applicable Indenture.

4.With respect to the Warrants, when both: (a) the Board has taken all necessary corporate action to approve the issuance and terms of the Warrants and related matters; and (b) the Warrants have been duly executed and delivered upon payment of the consideration therefor, pursuant to the applicable definitive purchase, underwriting, subscription, placement agent, warrant or similar agreement duly authorized, executed and delivered by the Company and a warrant agent, and the certificates for the Warrants have been duly executed and delivered by the Company and such warrant agent, then the Warrants will constitute valid and binding obligations of the Company, enforceable against the Company in accordance with their terms.

5.With respect to the Units, when both: (a) the Board has taken all necessary corporate action to approve the issuance and terms of the Units (including the applicable Securities underlying the Units) and related matters; and (b) the Units (and the applicable Securities underlying the Units) have been duly executed and delivered upon payment of the consideration therefor, pursuant to the applicable definitive purchase, underwriting, subscription, placement agent or similar agreement duly authorized, executed and delivered by the Company and any applicable unit or other agents, and the certificates for the Units (including any applicable Securities underlying the Units) have been duly executed and delivered by the Company and any applicable unit or other agents, then the Units will constitute valid and binding obligations of the Company, enforceable against the Company in accordance with their terms.

Our opinion that any document is legal, valid and binding is qualified as to:

A. limitations imposed by bankruptcy, insolvency, reorganization, arrangement, fraudulent conveyance, moratorium or other laws relating to or affecting the rights of creditors generally;

B. rights to indemnification, exculpation and contribution, which may be limited by applicable law or equitable principles;

C. general principles of equity, including without limitation concepts of materiality, reasonableness, good faith and fair dealing, and the possible unavailability of specific performance or injunctive relief and limitation of rights of acceleration, regardless of whether such enforceability is considered in a proceeding in equity or at law;

D. any waiver of stay, extension or usury laws or of unknown future rights; and

E. any purported fraudulent transfer “savings” clause.

Attorneys at our firm are admitted to the practice of law in the State of Arizona, and we express no opinion as to the laws of any other jurisdiction, other than the Federal laws of the United States of America, the General Corporation Law of the State of Delaware and, solely with respect to the Debt Securities, the State of New York.

You have informed us that you intend to issue Securities from time to time on a delayed or continuous basis, and this opinion is limited to the laws referred to above as in effect on the date hereof. We understand that prior to issuing any Securities pursuant to the Registration Statement (i) you will advise us in writing of the terms thereof and (ii) you will afford us an opportunity to (a) review the operative documents pursuant to which such Securities are to be issued or sold and (b) file such supplement or amendment to this opinion (if any) as we may reasonably consider necessary or appropriate.

We hereby consent to the filing of this opinion letter as an exhibit to the above-referenced Registration Statement and to the use of our name wherever it appears in the Registration Statement, the Prospectus, any Prospectus Supplement, and in any amendment or supplement thereto. In giving such consent, we do not believe that we are “experts” within the meaning of such term as used in the Act or the rules and regulations of the Commission issued thereunder with respect to any part of the Registration Statement, including this opinion letter as an exhibit. In giving such consent, we do not thereby concede that we are included in the category of persons whose consent is required under Section 7 of the Act or the rules and regulations of the Commission promulgated thereunder.

This opinion letter is given as of the date hereof, and we express no opinion as to the effect of subsequent events or changes in law occurring or becoming effective after the date hereof. We assume no obligation to update this opinion letter or otherwise advise you with respect to any facts or circumstances or changes in law that may hereafter occur or come to our attention (even though the change may affect the legal conclusions stated in this opinion letter).

Very truly yours,

/S/ Snell & Wilmer, L.L.P.

Snell & Wilmer, L.L.P