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Use the lowest degree locking piece you can to decrease bolt velocity with reliable function using your ammo and can. This holds true for all suppressed Hk guns. As stated by gopherboy a number 17 is indeed a good place to start.
 

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The factory HK Locking Piece for G3K is listed on World of HK: Guide to Locking Pieces as #18/50deg LP. So, the idea with adding a suppresor is you want to go down in degrees, to a LP that will increase dwell time, to prevent the bolt carrier from cycling harder. The #17 LP is 36deg, and I believe, the lowest they make (basing this off of what HKParts has available, some smiths, like Mike Otte, may very well have their own custom-grind LPs).

If your gun already has a #17/36deg LP in it, I would run that.
 
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