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Old January 16, 2011, 06:31 PM   #2
Senior Member
Join Date: April 25, 2006
Location: Amerika's Doyleland
Posts: 809
That engages the rollers, and controlls the delay of cycling. Due to teh increased backpressure of a suppressor, it would allow the bolt to unlock with less stress tahn a regular peice.

If you don't have a suppressor, you don't really need it.

ETA: Do you have an HK94 clone, or the SP89 one?
Is it a #28 peice in teh bag, or just looks like that?
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