JMac Customs RSA 1913 Brace Adapter (Stamped AKM)

A standard stamped AKM does not present a 1913 Picatinny interface; it has a fixed-stock rear trunnion designed for AK furniture. The JMac Customs RSA bolts to that rear trunnion and converts it to a 1913 rail, which opens the entire universal 1913 folding brace and stock catalog to the rifle. From there a folding 1913 brace like the SB Tactical FS1913 mounts directly for a true folding AK pistol setup.

The adapter is machined from 7075-T6 aluminum with a Type III hardcoat anodized finish and weighs about 3.4 ounces, so it adds the 1913 interface without adding much weight. This is the modular path to a folding brace, distinct from a one-piece solution like the SB Tactical SOB47: the RSA decouples the receiver interface from the brace, so you can run any 1913 brace or stock you prefer and swap later without touching the trunnion mount.

Fitment is receiver-specific and is the part to get right. JMac makes separate adapters per receiver type, and this SKU fits a standard stamped AKM rear trunnion only. It does not fit Zastava M85/M92 pattern guns, which require the JMac Zastava/YAKP adapter, and it does not fit 4.5mm folding-trunnion AKs such as SGL, Saiga, or KUSA. Confirm your receiver before ordering.