P Pucker New member Nov 10, 2006 #1 Hi, After firing a '20 upper on a carbine lower it worked fine. Now that I'm assembling a lower for that '20, do I have to get a full length tube, spring, and buffer? Or can I put one of these on it?
Hi, After firing a '20 upper on a carbine lower it worked fine. Now that I'm assembling a lower for that '20, do I have to get a full length tube, spring, and buffer? Or can I put one of these on it?
