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AR-15/M16/M4 Auto Sear w/Spring and Pin


Our Auto Sear with Spring M16 Assembly is a top-quality replacement part for your M16 or Post 86 AR-15 conversion. The auto sear allows for fully automatic firing and the included spring ensures smooth and reliable operation. This assembly is made from durable 4130 steel and is designed to maintain the performance of your rifle.


These Auto Sears are what you will need to convert your post 86 sample to full auto or keep your pre 86 sample running in tip top shape. USA manufactured contract over run M16 Parts to replace your used parts with new mil-spec parts. This kit is intended to replace full auto parts in a registered full auto lower.

  • 1 – Auto Sear W/Spring M16
  • 1 – Auto Sear Pin M16

Replacement sear pins can also be purchased on our website.

Caliber: .223/5.56

Finish: Manganese Phosphate

***NOTE: These M16 and AR-15 Auto Sears can be legally sold to retail consumers, dealers or manufacturers and are meant to be used as replacement parts for registered receiver weapons and post sample builds only. All NFA Rules Apply and Aegis Cerakote & Gunworks, LLC will not be held liable for any illegal use or misuse of this product nor will we provide any legal advice as to your city, county, or state regulations on possession of this product. ALL NFA RULES APPLY – This kit will not convert your AR15 Semi-automatic to full auto function and attempting to do so without the proper license is a violation of Federal law!***