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For: G&G M4/M16 Charging Handle SpringProduct Information:
great spring, i broke the original one on my CA M15A4. i was playing with it to much i guess lol. anyway, ya, so i stretched my original out. and i picked up a few of these as backups. there nice and strong.
BUT CAUTION: if your spring stretches out, carefully unscrew the screw and do NOT loose it. this spring does not come with a screw and they are very small and hard to replace at a hardware store(homedepot, lowes, etc.)