Relying on a 4" PVC pipe sleeve and a glove to stop shrapnel from a disintegrating shotgun action is like dipping minnows using a crabnet. At critical pressures PVC pipe dismembers like a pane of glass; wicked-sharp shards of plastic with razor-like edges. When we fooled with building & shooting PVC spud cannons years ago, some nimrod charged the screw-cap breech of a 2.5" barreled gun with carbueretor cleaner instead of hairspray or WD-40 (our preferred propellent). The results looked like a hand grenade going off inside a christmas ball. During any of these shenanigans, the operative word on safety should involve the words HANDS and EYES in big, huge, day-glo letters!!!
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