HK US MP5 .40 S&W Locking Roller, +2
The proper roller size is essential for proper headspacing of bolt gap. +2 / 8.02mm
Please Note: The price listed is per roller. Order 2 (pair) for a complete set for the bolt head.
An easy way to remember the size you need to order – plus-size rollers increase the bolt gap and minus-sized rollers decrease the bolt gap.
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