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Yeah the idea of the post is to limit compression to roughly the volume needed for the barrel length. The main idea, AFAIK, is to prevent the piston from slamming forward without resistance (like dry firing) because the BB left the barrel during the first 1/3 or 1/2 of the piston stroke.
As far as the FAMAS, the cylinder is different from V2/V3. If I recall correctly, it's slightly shorter (a few millimeters).
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