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Qlong · January 31st, 2011, 11:02

The UBR's receiver extension has a smaller different inner diameter than the stock WE, this will cause the top end of the bolt carrier to rub against the wall.

What brand of UBR was this?

January 31st, 2011, 11:02	#644
Qlong Division Trader rating Join Date: Jun 2007 Location: Scarborough, Ontario	The UBR's receiver extension has a smaller different inner diameter than the stock WE, this will cause the top end of the bolt carrier to rub against the wall. What brand of UBR was this? __________________ Weee!