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Any version two with ball bearings. They will cause a slight increase on your FPS due to the bearings compressing your spring a few mm's. They all basically do the same job. I have them installed on all my guns although IMO they don't really do all that much.
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Few individuals would view themselves as barbarous, no, instead they view themselves in a different light, a distorted reality that justifies who they are and what they have done.
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