After cleaning my Bushmaster XM15-E2S today, I am noticing some movement on the upper. This is its third cleaning. First to have the handgaurds removed. After cleaning the rifle, my brother and I struggled to get the delta ring back down, and the hand gaurds back on. Everything went back with no forcing of parts, but now I just noticed that the handgaurds, front sight, and barrel now "wiggle" back and forth about a mm or two. Anyone else seen this? I am not going to fire it until I get some competent advice.

Sounds like typical upper lower  movement!

I wasn't sure since I havent experienced that so far. It moves with very little pressure. Still normal?

My two 100% reliable Ar's have the same movement,one thing you could check is separate upper and lower(UNLOADED)grab the upper receiver and FSB and twist and see if you have movement between upper receiver and the barrel.

.........grab the upper receiver and FSB and twist and see if you have movement between upper receiver and the barrel.

Love them cartoon illustrations,the only way to get through to us G.I.s.

Quoted: My two 100% reliable Ar's have the same movement,one thing you could check is separate upper and lower(UNLOADED)grab the upper receiver and FSB and twist and see if you have movement between upper receiver and the barrel.

Appears that this is the case. Hear is what Bushie said:

" It is not unusual to have some play with the standard handguards but the barrel or front sight should not move on the upper receiver. If that is the case the barrel nut may have loosened up and would need to be retorqued to secure the barrel to the upper receiver.
           That being the case the barreled upper should be returned to us for correction under warranty by calling our Customer Service people at 1-800-883-6229 for an RMA return number. "

The store it was purchased at does not have the proper torque wrench to do it. Guess its going to Bushmaster. This is a -1 for me since this gun is only a month and a half old.

Ahhhhh! The fun begins!
I wonder if your FSB will be canted when you get it back.

Is this a common issue? My $300.00 AK is really looking nice sitting there next to my $1000.00 paper weight.

NO! My SAR1 is suking right now.Wont run 10rds without a ftf.