Aldeer.com Forums Alabama Deer Talk Guns N Gear AR10 scope mount 2.0?

So I have a Vortex Viper 30mm 2.5-10X44 scope. Mounted in a Vortex sport cantilever mount. Shot the gun, and scope kept sliding back. Took to to gunsmith to have rings lapped, shot it today, and scope slides back in the rings. Only put about 20 rounds thru it.

What will mount this scope properly and hold onto it? This is about to PMO between the gun not running properly and the scope not staying in place. It's freaking $20 a pop just to go to the range, and that doesn't include ammo.

Are AR10's finicky about mags? Mine seems to short stroke periodically. Doesn't eject the spent case, and halfway starts the new one. I had 1 of those today. Ran the steel case 147 grain cheapie monarch ammo fine, but put 5 rounds of AW 150 grain in it, and it short strokes the first one. Then didn't miss a beat.

Maybe it just need a little more shooting time to settle in? I have been running a 10 round Pmag. Gun is PSA Gen 3 lower with BCA side charging upper. I will say I don't think its particularily soft shooting for an Auto. Especially one that weighs 10 pounds. I am about ready to get a PSA upper and sell the BCA one.

I have ordered an enhanced buffer tube for it as well. Probably have to pay to have that put on it too.

Not sure what's going on with your scope, but almost all of my optic issues were due to me forgetting loctite. I have a Burris PEPR mount that I use on AR's. It's heavy, but rock solid.

Getting a PSA upper would probably make your life easier, doubt you'll get much for the BCA upper though.

It wouldn't hurt trying other mags, but it sounds like your rifle is undergassed. Does the bolt lock open after firing the last round?

I wanted an AR10 for years, but held off due to hearing so many stories like this. I saved up and got a Tavor 7 instead. I've never had an issue with it, and can't find anyone online who has either. It's not as accurate as AR's but good enough for the ranges most Bama folk hunt at. The short length makes toting a suppressed rifle through the woods much easier too.

Do you know what buffer weight you have? A lighter buffer may help.

Ar10's are slightly more finicky than 15's but only a little since there's more variation in designs. I'd start with gas block not installed correctly or needing a different weight buffer.it shouldn't be having reliability problems though unless it just doesn't like a certain ammo or magazine it happens.
Try different buffer weight first .extremely easy to swap and cheap then if still a problem check gas block.sometimes the tolerance between gas block and tube Won't work together and allow enough gas blow by to short stroke.ive dealt with this before you look at gas block where tube goes in and see if you can see a carbon streak blowing back out.thats first indicator.also after that can remove gas block and check the carbon ring around gas port on barrel to tell if gas block and tube are aligned with gas port .also try a different mag.i wouldn't give up on it.easy platform to get running but this can happen with wrong buffer and knuckle head kids putting these things together for bear creek
All are easy cheap fixes
If scope is sliding torque it more and if ring caps are touching each other bottomed out you need a new Mount can't be tightened anymore.
My troy m110a1 is very reliable .just as reliable as any other 308 battle rifle

It has a heavy buffer. It locks back on last shot. I had it professionally cleaned, rings lapped and everything reinstalled and bore sighted.

Would the heavy buffer make it kick harder? I thought it kicked harder than my 450 bm. You would think a 250 gran bullet in an AR-15 would thump worse than a 150 gr 308 in a 10 pound gun.

I'm concerned about over tightening the rings and damaging the scope tube. They are not bottomed out and it looks like they added some sort of material in the rings to create more surface area. That's how I know it's moving, I can see the material.

If you don't have a torque wrench you can use the small end of a Allen wrench or torx which ever it has and tighten it until you can't anymore to the point it hurts your thumb and that will put you close to 18-20 in lbs torque.just about impossible to damage a scope tube or leave any ring marks with that method.great way to tighten ring caps without a torque wrench .

A heavy buffer kicking harder is subjective. It's more reciprocating mass, but it happens slower. I prefer a heavy buffer, but I think I'm in the minority. A heavy buffer also puts less wear on the rifle by slowing down the bolt velocity. If your rifle is undergassed, a lighter buffer could help with reliability.

What kind of mags are you using? If it doesn't work with Pmags, then get rid of it.

I believe you said a while back you're getting a 1:00 ejection pattern. That would contradict an undergassed system, but I would still get the gas block and gas key checked for a proper seal. Those are the types of things that make it past QC with budget rifles.

Personally, I'd cut my losses and ditch that upper. Don't spend more on parts and a gunsmith than you spent on the upper. BCA may be fine for AR15's, but the AR10 is a whole other animal. PSA and S&W are the cheapest AR10's I would mess with. They will likely requiring some tuning though. I see the advantage of a side charging upper, but I avoid proprietary as much as possible.

Scope rings and tube should be degreased also and free of anything.heard of people adding Rosen inside scope rings which doesn't make sense when all it amounts to is scope isn't tightened down enough

Get a team warne cantilever

I can't say exactly where it was ejecting yesterday I was at Hoover tac and it was bouncing cases off the side of the lane . Yes using pmags.

I wonder if it is a bullet issue too. Just seems odd that it's fine with an Fmj, but let me run an hp bullet with exposed lead tip and then it gets temperamental. Yesterday I shot the Fmj first and no issues at all. First Hornady AW and then the xlcase doesn't eject and gets caught up half feeding the next one.

Clear it and it ran the remaing 4 fine.

I like the side charger for how I carry the gun for hunting. But it's awkward when clearing an issue. I'm going to take it to a tac place that opened up on 280 and let them look at it. It may end up going back to BCA.

I like it's a 16 in barrel too. PSA has 18's. Once I got it settled down with the AW it put 4 in a very small hole, granted at 25 yards, but it's not like it has a match trigger or a sandbag rest.

I think selling the BCA upper for whatever you can get will save you time and money in the long run. Seems like any savings on the front end of a BCA purchase is wasted on ammo and trips to the range. Especially dealing with AR10s. If I step up to the AR10 platform I’m buying a complete rifle. Just seems to be the easier more efficient way to go.

On your scope mount I’d upgrade to a Seekins, Nightforce, Badger Ordnance mount. With current production methods, lapping scope rings shouldn’t be needed any more.

There’s no way in good conscience that I could sell someone else an upper that wasn’t functioning properly. I’d send that raggedy bastage back to BCA and demand repair or refund.

Hope it didn’t come across as I’d sale without being up front. I’d sale as is but I guess returning if it’s an option would be better. But anything from BCA should be considered junk and a waste.

Well I took the gun to a place called "the armory" in pelham. They have already gotten into it and polished the feed ramps and checked it. They say it will not run hunting ammo at all. Runs ball fine. That's pretty much my experience with it.

I asked about options and they recommend a barrel replacement. I want to retain the side charging upper, and I want a 16 in barrel, so the options were send the barrel back to BCA, and or replace the barrel with a different one. So I ordered a faxon 16 in 5r super whiz bang barrel for it. It's LR308 pattern which is what the upper is, so I'll see if BCA wants to do anything once I get the barrel installed and make sure it runs hunting ammo. They said a faxon would be a good one.

I'm more irritated it sat down at Mark's for 5 weeks. I think I'm gonna order a trigger for it too.

A match grade barrel at that.