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For: Pro Arms 48Rd BB Grenade Shell Package (3 shells)Product Information:
These things are pretty sweet. I'll be honest, these are my first 40mm shells, so I have no comparison. They are solid and hold gas well, but only give them about 4 seconds or the extra will bust out with vigor until it reaches "normal". They fit perfectly, and they seem to function just fine. They seem like a fine alternative to more expensive steel and aluminum grenados. Don't forget to reset them by pushing in the primer alllll the way. You'll know it's all the way because gas ceases to vent when you try to fill it. If gas just comes out, you probably didn't reset it all the way. I am thoroughly satisfied with these babies.
Nice spread of BBs
They are black. I don't really care.
They are polycarbonate, which may or may not be worse than metal.