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OEM

Just buy a used real m4 complete trigger group .That will solve all the clones problems.And real pistons won’t fit a real m4

I've replaced the recoil spring and added a stronger magazine tube to help with feeding/ jam issues. One other problem is the magazine cap retaining shoulder pin comes out every time I clean/ disassemble the gun. Real M4's have a shoulder pin inserted from behind with a true shoulder to keep it in. When I took apart the pistons, the O-rings were disintegrated.... not even 100 rounds. I bought replacements online. The gun just seems cheap. It functions, but may jam every 10-15 rounds, then I'll need to clear it... not good for a self defense shotgun... I need more reliability.

Probably shot a hundred slugs through it, cleaned it and sent it back... Those mechanics have the best jobs...