Current pricing for a semi auto BREN ?

[WallyG.]

Remember these US semi-autos are re-welds... if the receiver warped during that process then the barrel's gas block in the gas cylinder opening and/or the barrel shank in the barrel socket could be binding as the warped receiver may no longer have them in parallel. I've had a few that loosened up when I polished the offending surface with Emory cloth. Machinists have a great die they use... if applied and the barrel is driven home and then removed... the coated surfaces areas scratched/abraded at the interference fit areas. These high areas can then be gently lowered and potentially resolve the barrels too tight fit.

Information

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[Joe H]

Guys,

For binding slides, threads and similar problems on rewelds I've found that Timesavers lapping compound works well. It's a powder you mix with oil. The difference between Timesavers and regular lapping compound is that Timesavers will stop cutting so you don't have to worry about getting every last bit out. It's particularly useful if you can't isolate exactly where the binding is occurring.

Everyone has their favorite method to get those pesky reweld binding problems solved.

Joe

[tr63]

I need to update as the fix for the barrel not falling out the way it should . The problem was found that the gas cylinder on the end of the receiver was out of round and the barrel gas block was binding in the inside the cylinder . The cylinder was replaced with a as new one I purchased from BRP. The old cylinder was removed by drifting out the retaining pin with a proper size punch . the pin came loose on the second blow of the ball pen hammer !! The gas cylinder was drifted out using a brass 1/4'' flat bar stock and a ball pen hammer ,it also came loose on the second blow !! the replacement cylinder was polished using 600 grit wet and dry paper and was driven in,being careful to line the hole for the retaining cross pin . The cylinder was coated with anti-seize before it was inserted to insure I could remove if I needed to for some reason . Before I reinstalled the retaining cross pin I placed the barrel on the gun to check for the Gas regulator fit and the barrel fall out . It was perfect , the barrel slipped on locked down and when the locking handle was raised it slide out when the gun was tilled nose down !! The same retaining pin was reused it fit very tight . I was amazed that I was able to remove the old cylinder and the cross pin with no problems and reinstall the replacement parts and the old cross pin . I have read the horror stories about having to use torches to heat the cylinder and still not being able to get the cylinder driven off! Maybe Peter was looking over my shoulder !