To complete the assembly for (a commonly referenced file for a 3D-printable firearm component), you typically need a standard AR-15 Fire Control Group (FCG) and a Lower Parts Kit (LPK) . Essential Components
A full Fire Control Group includes the following mechanical parts, which are not 3D-printed due to the high stress of operation: FAPv1.zip
: Two 0.154" diameter pins (hammer and trigger pins) are required to hold the assembly in place. Where to Find Them To complete the assembly for (a commonly referenced
: You will need a hammer spring, trigger spring, and disconnector spring. You can purchase these as a complete kit
You can purchase these as a complete kit or as individual pieces from retailers such as:
: If you need the safety selector and detents as well, look for kits from Black Rifle Depot . Fire Control Group - smf tactical, inc.
: Ensures the weapon doesn't fire automatically.