It seems like PDI's quality control is simply slipping... I've had a PDI 150 in my MP5 now for a few years without any problems. Save for the cracked box, but that was to be expected. A CA reinforced box quickly fixed that problem. Probably best now to just stick with TOP or Promethus springs; Systema in a pinch, lol!
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“You hear the far-off crack of a rifle, your fate finally registering in your subconscious far too late as the white hot bullet penetrates your skull. Another round slams into the chamber even as your lifeless body falls to the ground…”---Unknown sniper
“Invisible souls leave .308 holes.”----USMC Recon Sniper
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