For the carbine lower, there is no full size buffer tube. It is "carbine" size and comes in fixed, 5 position and six position. If you have a standard m16 style butt stock you would have a standard,non carbine buffer tube though. Any ar15 upper will work on any lower reciever, as long as the upper and lower are for the same caliber such as 5.56..
As far as weight goes, there are typically four weights:
The regular carbine buffer has 3 steel weights, - 3oz
H is 2 steel, 1 tungsten - 3.8oz
H2 is 1 steel, 2 tungsten - 4.6oz
H3 is 3 tungsten - 5.4oz
I find the middle of the road to be the 4.6oz and tends to cycle less harsh with the carbine gas system.
building ar15 rifles for 10 years
· 9 years ago