View Full Version : Problems using carbine length receiver extension with rifle length barrel?

05-21-2009, 12:07 PM
Been trying to search for this answer all over, but haven't had any luck with this specific problem:

Building up an AR with an 18" barrelled upper, intermediate length gas tube. Is there any drawback/dangers/things to look out for if I use a carbine length receiver extension and carbine spring/buffer with this set up? Or do I need to use a full length extension tube and rifle spring/buffer with a long barrel AR?

Mostly wondering about the reliability of the cycling and wear and tear on the BCG.


05-21-2009, 12:40 PM
No, no problem with it at all. Many people have done it. I personally think it looks goofy, but that's a whole different issue! :)

05-21-2009, 3:33 PM
what about the opposite? cabine with full size tube/buffer set up?

05-21-2009, 6:31 PM
I run a 20" target upper with a carbine buffer/spring set-up and 6-position extension.

Yeah, it looks a little odd...but necessary for me in obtaining optimal LOP/cheek weld/eye relief.

Standard rifle stock length is too much for me.