I took my AR apart today, every piece was cleaned oiled and put back. BUT....

I noticed that as I took the buttstock off there was no spacer, It's an A2 stock. I never took the buttstock apart since I purchased it from Bushy a few years ago. I've shot maybe 1000-1500 rounds through this lower so far with no issues. Is this ok, or just "a matter of time"

Thanks

Just a matter of time.

The spacer is used because the A-2 stock is longer than the A-1.  Both stocks use the same receiver extension (tube), but without the spacer for the A-2, there is a void between the butt stock end (butt plate), and the back of tube.  Over time, the butt stock will become loose, and as you tighten the screw up to tighten the stock back up, the screw will tear the plastic butt plate. When this happens, the screw will intrude into the back of the tube (limiting buffer rearward travel), which will cause the carrier to short stroke with the bolt not looking back after last shot.

P.S. The spacer may just be stuck in the back of the butt stock receiver extension channel, and the reason that you think the rifle is missing the part.  If all else fails, pull the butt plate and check it out.

I pulled the buttplate and there is no spaer anywhere to be found. I'll have to pick one up at a show or something.

thanks