If you have a 10/22 with a steel bolt stop pin, in time the bolts impact will elongate the holes in your alum receiver. You need a bolt buffer. Here is a link for the least expensive bolt buffer I have found. 1 for $5 or 3 for $10. Check out this site:
http://www.weaponkraft.itgo.com/
http://www.weaponkraft.itgo.com/