Attachment 1 - Salient Characteristics - 10 Feb 2026.pdf

This is a Salient Characteristics document for M4 Trainer Weapons (Contract F2MTBG6029A001) issued by 502 CONS/PKBB at JBSA Lackland, Texas. The document specifies the detailed requirements for a non-weapon training device designed exclusively for Air Force Basic Military Training (BMT) weapon-handling instruction. The M4 Trainer must replicate the external form factor of an M4-style duty weapon while incorporating permanent internal design features that ensure it remains ATF-exempt, non-convertible, and non-functional as a firearm.

The trainer must incorporate multiple permanent safeguards preventing conversion to a functional firearm, including: no chamber or barrel structure, no rifling, permanent physical ammunition obstruction, incompatibility with firearm bolts or components, a purpose-built non-gun trigger with an anti-walk pin, and incompatibility with firearm barrels, chambers, or fire-control systems. Physical specifications require a weight of approximately 6.5 lbs (±0.5 lbs), barrel length of 14.5 inches, overall length of 29.75 inches (stock closed) or 33 inches (stock extended), one standard 30-round metal magazine, black MIL-SPEC furniture, and a standard 1-inch nylon sling with minimum 2 metal/plastic buckles. The device must disassemble into ten major components (Upper Receiver, Lower Receiver, Charging Handle, Bolt, Bolt Carrier, Firing Pin, Firing Pin Retaining Pin, Cam Pin, Buffer, and Action Spring) consistent with standard M4 platform familiarization training, enabling realistic takedown and reassembly procedures without firearms-related hazards.