AR-15 Receiver Slop/Loose Fit?

[Still 2 Many Choices!?]

Took me forever to post this but heres the "AFTER" effect..

This 5 shot group was shot with my stock 14.5" heavy barreled Bushmaster with AK brake and surefire rail(not free floated), using 55gr Remington FMJ off of sand bags at 100 yards... The "flier" was the first shot, and I knew I threw it low. The rest of it was the outcome after I slowed down. Not bad after I got rid of the slop, but from what I hear from you guys, it really shouldn't make too much of a difference...

Still 2 Many Choices!?

 

[13013t]

Try a #7 O-ring on the front pivot lug.

 

[Waywatcher]

Uhh... Welcome to THR...?

For your first post you dug up an already-resolved 4 year old topic? (Also, your suggestion was exactly covered in the first response to the thread.)