WTF did they do to this lower

kwelz · #1 05-10-12, 15:35

I picked up this Colt lower complete for 200 bucks so I am not complaining too much. However after I got it home I noticed this.

At first I thought it was just gunk. But it is hard. As far as I can tell it is JB weld or a similar filler. It almost looks like the poured it in there then smashed an upper down on it.

When I attempted to put my uppers on it they fit but are pretty tight.

Has anyone EVER seen something like this before?

!Nvasi0n · #2 05-10-12, 15:41

Looks like someone did a redneck "bedding" job to tighten up a sloppy UR/LR fight. I'd be pretty sore about that.

kwelz · #3 05-10-12, 15:55

Meh. For what I paid I am not too upset.

I checked with the seller. It is JB weld.
Any easy way to remove it?

TacticalSledgehammer · #4 05-10-12, 16:00

Oh baby!

I'd leave it in there unless it screws with your upper. I'd try sticking a wood burner in there to see if heat would loosen it up, then try to remove it. Idk

ICANHITHIMMAN · #5 05-10-12, 16:13

I have seen that once before on an Olympic lower I bought. I cleaned it out but it was not JB weld I dont know how to get that out.

Guns-up.50 · #6 05-10-12, 16:21

You may be able to use a small grinding bit on a dremal if you have one, obviously be careful not to take too much off.
But I guess it it isnt hurting anything I'd leave it, hell for 200 good buy!

a0cake · #7 05-10-12, 16:24

Q: How can I remove J-B Weld after it is fully cured?

A: When fully cured, J-B Weld can only be removed by grinding or filing it off, or by directly heating the product above the 600 degree maximum temperature threshold.

Sucks that somebody did that to a perfectly good lower. Not that there's anything really wrong with it now as long as it's not retardedly tight...I'd probably just leave it.

The_War_Wagon · #8 05-10-12, 16:28

At least it won't come apart, like an accu-wedge!

tonyxcom · #9 05-10-12, 16:35

I'd take a small drill bit and drill a bunch of holes into the JB Weld then carefully chisel it out with a screw driver.

scoutfsu99 · #10 05-10-12, 16:56

Quote:

Originally Posted by !Nvasi0n

Looks like someone did a redneck "bedding" job to tighten up a sloppy UR/LR fight. I'd be pretty sore about that.

$200 for what looks to be a complete Colt lower.....I think I'd live just fine with that. If it doesn't affect function I wouldn't touch it. If you're determined to get it out, I would send it off to somebody reputable who probably has better knowledge/tools and let them tackle it.

Suwannee Tim · #11 05-10-12, 17:56

The best way to get it out would be to machine it out on a mill but unless you have access to a mill the cost would be excessive. Ain't many chemicals will touch epoxy, heat will work a hurt on it but it has to be pretty hot, hot enough to draw a temper on the aluminum so you don't want to heat the whole thing. I like the idea of a wood burner or soldering iron. The fumes of burning epoxy are pretty nasty. BTW if you ever smell the fumes of burning epoxy from under the hood of your car it means your alternator is dying. Are you going to have it re-anodized?

Blankwaffe · #12 05-10-12, 18:07

Bedding AR receivers is or was pretty common in the high power arena when I was playing.In fact I had my old M15A2 NM bedded by an old Gunny that frequented Camp Perry when I was attending.Seems the AMU had an article on the subject a few years ago as well.

In this case,if the upper fits on the lower and there is no resistance when the take down pin is pushed in/out,then I'd leave it alone and run it.No harm done.If not I'd use a dremel and clearance the bedding enough for the new upper to fit and roll with it.

CC556 · #13 05-10-12, 18:10

If it doesn't cause a problem with your upper, I'd just leave it alone. It's not like it's going to cause any problems.

BCmJUnKie · #14 05-10-12, 18:10

Just shoot it.

Its cosmetic....and its hidden.

Its kinda wierd you didnt inspect it before you bought it???

Cesiumsponge · #15 05-10-12, 19:02

Try "aircraft remover" with dichloromethane. I've used it to break down epoxy and strip powdercoating. It's nasty stuff so ventilate well and wash your skin if you get splashed because it WILL start burning like a mofo shortly. The last quart can I picked up was a Rustoleum brand at Autozone for about $15.

kwelz · #16 05-10-12, 20:38

Thanks all. I think I am just going to leave it the way it is since the uppers I have tried seem to fit.

I did inspect the lower. Hell I even took the FCG out to check them. But somehow I missed this. Honestly I dont even remember popping the takedown pin out so I guess I screwed up there.

Also there is. I reason to refinish it. The only real wear is the rear takedown pin and where the CH slides. I dont think this has seen my much shooting.

DJTHEMAC · #17 05-10-12, 22:43

Quote:

Originally Posted by The_War_Wagon

At least it won't come apart, like an accu-wedge!

This actually. I have heard of people using bedding atmerials to permanently miminize play between the upper and lower receivers

gatorfan605 · #18 05-10-12, 23:12

Quote:

Originally Posted by DJTHEMAC

This actually. I have heard of people using bedding atmerials to permanently miminize play between the upper and lower receivers

I'm not a gunsmith, but it seems to just be an accuwedge.....albeit, a permanent one.

DIRTMAN556 · #19 05-10-12, 23:19

Ha, that is too funny. Looks like it works.

LowSpeed_HighDrag · #20 05-11-12, 00:58

You sir have an epoxy bedded lower. Unless your upper wont fit on it, leave it alone. It isnt hurting anything.