This is about as short as I can get an M4 and still keep it worth pulling the trigger.
Parts bin M4, CYMA metal box, chopped Noveske handguard. Inner barrel’s about 75mm long so only hitting just over 200FPS as is.
Slated for three teeth off the sector, cylinder porting, substantial spring upgrade, AOE correction / piston cushioning, should up the power a bit. I’ll be happy with 250ish.
Keen to see what chunky little nuggets others have cobbled together using an M4 as a platform.
Unfortunately I don’t have any pictures of it, but built up a shortie M4 Gen8 that I forward wired and ran a PEQ Battery Box so I could run it sans Buttstock that ran an 110mm barrel… which was sorta restricted to what handguards were available at the time.
Was a fun little Machine Pistol basically and VERY short without any Stock fitted, but with the advantage of a decent sized Magazine capacity.
Ran around 230 FPS for memory.
Nice. Everyones going to laugh but here’s my $90 Nylon Wells CQB.
Alloy head, 7.5mm brl, 1.18mm AG, o ring. Original gearbox. It’s done over 1.5M gel balls and still keeps soldering on with minimal maintence.
Changed a few asthetics to tickle my fancy, iron sights, stock, hop up, etc. 290fps all day fed by drum mags, stick mags too.
Nope… no laughing here. 
good looking little unit.
It ain’t about the brand or brand reputation. If you built that up and it’s lasted as long as it has then it’s a good’un… period.
Just the bad rap the wells get. Back in the day they were a budget blaster that worked great after a bit of bench time if you are up for it. Less than my LH Steyr AUG, and a lot less than my pre production AK74L. Was a test model to give feedback to the manufacturer after it got tested by a forum member.
Spent 2 whole days straightening the AK74L out, the metal front end was not straight, front sight was uts, despringed and re oringed it. Re did the magazine well was UTS as I could see what the problem was and why it was misfeeding. The bloody magwell extension shit was not allowing the mag to lock in the correct place. Grinder out and sorted that out. Bingo, now we are on. In the bin you go with that mag thing.
Now the AK is rocksolid 300fps all day and very accurate. When you go winchester it weighs 4.5KG just dong em on the head with it 
What mag have you got in yours @Friendly_Fire I like the og look of that I do have a full size M16A1 ish that is V2 and takes G8/9 Mags.
Good looking unit. I get it, why change it if it’s working so well?
That’s a CYMA stanag hanging out of mine. Shitty, I know… but it’s not a high ROF blaster so the CYMA keeps up… no misfeeds.
I took the birdcage flash hider of it and put on an XM177 moderator. Lets me use a barrel about 140mm long and allows an 11mm hopup.
Gained about 30 or so FPS out of the longer inner.
