Quoted: Spacer for what? Were you reffering to a rifle receiver extension or CAR receiver extension?
ETA: I thought the CAR receiver extension does not call for a spacer.
|
The 9mm spacer you are referring to would be needed if you wanted to use a CAR buffer in a rifle length tube. There is still going to be overtravel of the bolt though because a 9mm bolt is shorter than a 5.56 bolt/bolt carrier. You would still need an additional spacer to prevent the possibility of bolt catch breakage.
The spacer I was actually referring to is one that you would have to make yourself to reduce the amount of overtravel the 9mm bolt has regardless of what stock is used. This overtravel is inherent in the design, since the blowback design of the 9mm bolt doesn't have a separate bolt/bolt carrier and is shorter than the 5.56 bolt/bolt carrier. If you don't want to make a spacer to reduce/eliminate 9mm bolt overtravel and the potential for bolt catch breakage, you can always buy one of Slash's extra long and extra heavy 9mm buffers. I believe they are available in the EE or from Hahn Precision direct.
If you can't visualize what I am talking about, you may need to have a 5.56 AR and a 9mm Colt-style AR in front of you so you can actually compare the 9mm bolt to a 5.56 bolt/bolt carrier and see how far each can be pulled back behind the bolt catch when assembled.