For maximum phalangycal dexertorous efficieny, they are required. All SOCOM members have them installed on all magazines. They are a tad undersized to insure proper contraction on the magazine to avoid any hanging up in the mag due to stuffing them to full capacity. The tension that they provide for the mag stabilizes the round to increase the lethality, penetration, and accuracy by 73%, no documentation needed.
Oh, hell, I don't know?!?! Cause they look cool, and they are one of the cheapest Barbie upgrades you can put on your rifle??
Oh, hell, I don't know?!?! Cause they look cool, and they are one of the cheapest Barbie upgrades you can put on your rifle??