There's alot of space in there but I'm not entire sure.
The cocking handle spring goes a bit into the receiver if I remember correctly. But it should fit inside the hollow copper pipe. I'd have to examine my own MP5 to give you an answer for sure.
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Quidne - Latin: Literal translation "Why Not?"

TM Sig P228
KA FN FAL
Canada's resident KA FN FAL expert.... apparently
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