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dlraymond30
10-21-17, 00:33
Alright guys (and gals?) I have a doozy for ya: I picked up a damaged Colt upper receiver from a guy as an add on in a trade because I wanted it and he didn't so it cost me nothing and its a Colt with the C mark and the damage came from being in a vise improperly (he said it was against the upper pic rail and in between the pin lugs... pics should show) while removing the extremely overtightened barrel and now it is ever so slightly twisted or "torqued" to where the carrier rubs at the rear and is at a slight angle when in the receiver. It also requires some opposite torque to get the rear takedown pin through the lower to upper but when it does go together is twists the receiver the opposite direction and seemingly works just fine but I want to see if there is a way to "fix" the mild twist in the upper as it is super tight to my Colt 11.5" barrel I just bought AND its, well... a COLT with the C mark. There is also some outward bend below the front of the ejection port (where the bottom of the receiver was secured in the vice, apparently) and I want to make sure that wont cause any untoward issues due to the 5.56 pressures...
I know if there is anyone who can help me its all you eggheads here on m4c.
Any help/options/guidance is MUCH appreciated! Let me know if you need more detailed pics.

**pics coming in a moment**

Regards,
Darrin

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Overall side view with a bcg and where it stops due to the friction in the rear and the lightened part in the material below the port opening is where the slight bend is

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If you look closely you can tell the carrier is rubbing against the right side of the receiver

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The friction is enough that it keeps the carrier from falling all the way when placed vertically

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Another view of the carrier and where it stops without a little push

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In this you can see where there is a slight outward bend below the front portion of the material below the ejection port

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Here you can see some of the damage that the vise teeth did to the pic rails.

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Extra picture for more detail

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And finally here is a pic of the bottom of the upper and you can see where the guy filed or sanded part of the upper below where the minor outward bend is. I don't know why.
M Sadler
10-21-17, 07:09
There's NO chance you put a twist on 7075-T6 receiver, none. Every minute you spend on this is one you'll never get back. Time to cut your losses and junk it.
GH41
10-21-17, 08:19
There's NO chance you put a twist on 7075-T6 receiver, none. Every minute you spend on this is one you'll never get back. Time to cut your losses and junk it.

^^^^What he said^^^^ Especially considering a good stripped receiver can be had for 80 bucks.
Campbell
10-21-17, 08:50
Paper weight.
Aetius
10-21-17, 08:58
Here's how to fix it:
https://www.bravocompanyusa.com/BCM-Upper-Receiver-Assembly-M4-Flat-Top-demo-p/flat%20top%20-upper%20-m4%20demo.htm
26 Inf
10-21-17, 09:00
Buy your buddy a WECSOG tee-shirt and use the receiver as a paperweight or for assembly practice with buds.
556Cliff
10-21-17, 09:24
He couldn't be bothered to buy a clam shell upper receiver vise block I guess.

Yeah, it's junk.
dlraymond30
10-21-17, 13:23
Yeah thats what i assumed. I asked him how it happened and he used no attachment method. I was just hoping i could salvage it but oh well. Hey it was free lol
PaLEOjd
10-21-17, 14:42
Not really a fix for that type of damage. Your best option is to go ahead and do what others have recommended. Scrap that destroyed upper and get yourself a BCM 'demo' upper, then enjoy.
Just curious....How tight was the barrel that the receiver was twisted that bad?
dlraymond30
10-21-17, 16:06
I dont know, he just said it was "average colt overtorquing".... Whatever the hell that means. I noticed that my aero upper has the same square forge marking but barrels just drop right in and isnt tight at all... But the colt one is super tight! Interesting how two uppers from the same mfgr can vary so much
556Cliff
10-21-17, 17:29
I dont know, he just said it was "average colt overtorquing".... Whatever the hell that means. I noticed that my aero upper has the same square forge marking but barrels just drop right in and isnt tight at all... But the colt one is super tight! Interesting how two uppers from the same mfgr can vary so much

The company that that forged the upper (as indicated by the forge marking) has nothing to do with the final machining of the upper.

People make way to big of a deal over who the forge was when they really have nothing to do with the final finished product. They just provide the solid chunk of aluminum forged into the rough shape of the upper or lower.
556BlackRifle
10-21-17, 18:55
That upper receiver is history. Time marches on and so should you.
jurassic
10-21-17, 19:12
That happened to me only once, then I bought a Geissele Reaction Rod for building and stopped taking apart factory uppers. It's toast.
SteveL
10-21-17, 21:48
It's a shame that upper is ruined, but there is no salvaging it. Rebuild the assembly on a new upper and move on.