These bullet guides are for the .223 Saiga and Vepr rifles. Installation of this guide allows your rifle to feed high capacity AK 223 magazines. Shown below are the guide install kits shown with #8-32 drill & tap. (note: pics may not reflect actual geometry)
Round Trunnion Kit
Flat Trunnion Kit
Round Trunnion Left, Flat Trunnion Right
The front trunnion is the block of steel riveted in the front of the receiver that the barrel is pressed into. The shape description comes from the shape of the area immediately below the chamber face.
Trunnion with Rivet Hole drilled (round or flat)
If you have a rivet hole drilled in your trunnion, select the rivet guide kit (223RTGR or 223FTGR) which includes a screw and a nut.
The bullet guides have a machined barrel relief on the front which tucks under the barrel face. The holes goes bottom dead center in the 6 o'clock position.