Quoted:
I'm familiar with the Troy PDW but not with this one. I have a few questions on this system if anyone here can help. What type of action spring does this use? Does the stock rods interfere with the selector operation when the stock is fully collapsed? Does the barrel porting need to be modified?
this is the same stock used on the troy trunk monkey guns. it uses a modified carrier/buffer and a cut down carbine action spring. the selector is still easy to manipulate with the stock collapsed. i've run a 7" , a 10.5" , and 11.5" 5.56 uppers without any issues or modifications needed. next range trip i'll be able to test an 8" 300blk upper out with it.