Milspec Active Reset Conversion (MARC)

 

Compared to other similar products on the market, the lever arm of the MARC is:

 

A. Made of properly heat treated and nitride coated S7 tool steel. 

 

B). Proper dimensions on all interacting surfaces, most importantly to prevent binding on the trigger while the hammer is cocked farther back by the bolt.

 

C) Edges are rounded to prevent crack formation.

MARC-Compatible Triggers

 

This list is not exhaustive, and inclusion on (or omission from) this list does not guarantee compatibility in every possible configuration. There are many variables involved, and it is not feasible to test every combination.

Our standard test configurations are as follows:

• Aero Precision Gen 2 Lower / M4E1 Lower

• Standard carbine buffer tube with carbine spring and H2 buffer

• A5 buffer tube with A5 spring and H1 buffer

Additional requirements:

• An M16-cut bolt carrier group (BCG) is required

• A low-shelf lower receiver is required, or the user must be comfortable modifying their lower to a low-shelf configuration
  
  
  

- Geissele	SSA*	Two Stage	YES
- Geissele	SSA-E*	Two Stage	YES
- Geissele	SD3G*	Single Stage	YES
- Geissele	SD-E*	Two Stage	YES
- Geissele	SSAEX	Two Stage	ONLY WITH MODIFICATION YES- DO NOT PURCHASE IF UNWILLING TO MODIFY
- Geissele	SSAX	Two Stage	ONLY WITH MODIFICATION YES- DO NOT PURCHASE IF UNWILLING TO MODIFY
- LaRue	MBT-2S (Flat and Curved)	Two Stage	ONLY WITH MODIFICATION YES- DO NOT PURCHASE IF UNWILLING TO MODIFY
CMMG	Milspec	Single Stage	NO
DPMS	Milspec	Single Stage	NO
Jacob Gray	Jacob Gray Single Stage	Single Stage	YES
MimTac	MimTac Drastic	Single Stage	YES
Noveske	Noveske Single Stage	Single Stage	YES
PSA	PSA EPT	Single Stage	YES
PSA	PSA Custom SS Drop In	Single Stage	YES
Rise Armament	Rave 140	Single Stage	YES
Rise Armament	RA 434	Single Stage	YES
Rise Armament	RA 535	Single Stage	YES
Rise Armament	RA Blitz	Single Stage	YES
Rise Armament	RA LE145	Single Stage	YES
Rise Armament	ICONIC	Two Stage	NO
Schmid Inside	Schmid Two-Stage	Two Stage	ONLY WITH MODIFICATION YES- DO NOT PURCHASE IF UNWILLING TO MODIFY
Schmid Inside	Schmid Pro Line Trigger	Single Stage	YES
Schmid Inside	Schmid Inside GI Flat Face SS	Single Stage	YES
Schmid Inside	Schmid Inside Match Flat Face SS	Single Stage	YES
Smith Defense	AR15 Lower Parts Kit	Single Stage	YES
Sons of Liberty Gun Works	SOLGW LFT	Single Stage	YES
Spikes Tactical	Spikes ST Battle	Single Stage	YES
Timney	Timney Competition 3LB	Single Stage	YES
Timney	Calvin Elite	Single State	YES
Heckler Koch	HK MR556A1 Trigger	Single Stage	NO

*some Geisseles may require some amount of polishing or small material removal on the top of the trigger shoe tail due to tolerance stacking.

Without proper tuning will cause premature wear. We will warranty any that deform regardless (excluding negligent retardation), but at this time we strongly recommending a 10+oz buffer weight or a captured/hydraulic buffer (the heaviest that is available) with the MARC if you're planning on running them with a blowback 9mm. For a tuning guide with full explanations check out the following video from Blowback9 on Youtube, he is a wealth of knowledge for your AR-"SMG"/AR-PCC needs.

 

 

 

In principle, the MARC does operate in a similar fashion to other products, but it remains legally and mechanically distinct due to the multitude of functional, material, and aesthetic improvements implemented by Cornfire Arsenal LLC.

These improvements reflect independent engineering judgment and upgraded material selection intended to correct what we consider to be inferior or unreliable implementations found in other products on the market.

The MARC design prioritizes durability, and long-term reliability.

 

Particularly because due to the life saving nature of the systems they may be utilized in.

 

For specific details review below.

 

 

 

 

 

 

 

 

If you have legality concerns please refer to the following ATF.gov case which rules forced reset trigger to be enable only semi automatic operation FRT Legal Determination.

 

 

Disclaimer

Inquiries

Cornfire Arsenal LLC is committed to transparency and good-faith communication. Any individual or entity with questions or concerns regarding the design, function, or legality of our products is encouraged to contact us prior to pursuing legal action.

Please reach out to: admin@cornfirearsenal.com

Firearm Functionality Notice
The above product, when properly installed and left unmodified, is designed and intended solely for lawful semi-automatic operation. It is not capable of automatic fire, nor is it readily convertible to enable automatic or burst-fire operation. The product actively resets the trigger, producing one discharge per individual trigger pull, in full compliance with all applicable federal firearm laws. It is up to the end user to educate themselves on legislation that applies to their state or locality. 

Intellectual Property Statement
This product incorporates design principles that are consistent with those recognized as lawful in prior judicial and regulatory determinations FRT Legal Determination. It does not use, reproduce, or infringe upon any patented, copyrighted, or otherwise protected intellectual property belonging to any third party.

Independent Development: While the MARC may operate on general mechanical principles similar to other semi-automatic trigger systems, it is legally distinct and non-infringing under established categories of intellectual property law. The trigger group interaction and reset system were developed entirely in-house, without access to or use of any competitor’s CAD files, proprietary data, or patent-protected materials.

Functional Necessity/Non-Substantial Similarity: The MARC incorporates distinct mechanical geometry, material composition, and sequencing, resulting in substantial design and feature set deviations even where the general operational concept remains the same. All being necessary to fulfill quality standards required by its intended use. The mechanical act of resetting a trigger or releasing a hammer at certain points in an operational cycle represents a functional process that exists within the public domain and therefore cannot be copyrighted, as protection applies only to a unique expression or design. 

Distinct Aesthetic Design: The MARC features aesthetically distinct components, including a modified mil-spec safety selector profile and other externally visible differences, providing clear differentiation in both form and trade dress.

 

 

****12-22-25 Updated Information regarding Configurations and tolerances as well as disclaimer about Geissele triggers tolerance stacking.