That’s about the only way I can describe it, it’s a M2hb and it’s riveted to the top plate just forward ov the back plate assembly, it’s a peg that hangs down and the trigger bar rests against it. My kit came with a new top plate and I need this part, so can someone tell me the correct name ? Where can I get one ? The dimensions so I can make one ? It kinda reminds me of the front right cartridge stop for a 30-06 on a 1919A4, thanks for any input. Jon P.