Hey, not knowing all the parts and there names i thought that the flash hider was a fixed moulded metal part never dawned on me to think it actually came off, hence the cryptic Q? as i would of spent hours searching for some type of adapter to fit the end.
I would of been quite happy for someone to just say " Try unscrewing the flash hider you idiot " then i would of been on my way . Whilst on the subject any other part of an M4 apart from the RIS rails that comes off that dos'nt pop out at ya so i don't ask any other silly Q?.
Make model serial number it was a DBoys M4 ( I love it)