ironmonster

Yep, looks like the one.

Nope I haven't. It is a Rainer Select barrel and they dont list the spec's on there site either.

Well that in and of itself would solve my issue

I just ordered 6.5oz buffers and his recommend springs from heavybuffer.com $296 shipped for two springs and two buffers. Hope it helps Anyone want to buy a couple of very slightly used high zoot Tubbs flat coil springs? Need a couple of standard DPMS buffers?

Other than changing out the Tubbs spring changing the rest of it would have no effect, the only way the spring could have any effect is if it's collapsed hight was thicker thus limiting the carrier movement but that would just mean everything was collapsing to a dead stop, still a crash and not the intent of the system(is it?) I can't imagine the goal is to collapse the spring 100% so the carrier crashes to a dead stop at the end of the stroke. I need a heavier buffer, a stronger spring or less gas, the spacer I put in the buffer tube makes it impossible for the carrier to contact the buffer tube boss. The other thing is this buffer tube is not coming out, ever. After the damage done to the end it's going to damage the receiver and probably destroy the tube as well. Since it will work as it is and they both may be junk if I try and tear them apart it seems smart to just deal with it as is.

Well, the O.D. Of the carrier does not matter as long as the I.D. Of the buffer tube is sufficent that there is clearance, it does. The cross section of the sectional change in the carrier does not matter because no matter what size it is it's still not going in the buffer tube. The only measurements that I could see are relevant is from the rear of the carrier to the sectional change in the carrier, the depth of the buffer tube, the compressed thickness of the buffer spring and lenght of the buffer itself

I take that back, the Tubbs adds lenght in the middle which will do some good. Brain fart this morning

If it will cycle with the spacer in there I'm ok with that fix. It's obvious the buffer is too light and/or its over gassed but the buffer bumper still should stop the carrier before it crashes. The PWS tube is 1/8" longer than another random buffer tube I grabbed (7" vs 6-7/8"). So that plastic spacer should do restrict it. However it still means that buffer is slamming into the back of the tube every round fired. I think it's normal to touch but considering the damage done the carrier is still going full tilt at the back of the cycle. With the spacer the bolt locks on the catch and will move about a 1/4" back from there before everything bottoms. I ordered the Tubbs cws but I think as far as lenght goes it hurts not helps, it adds lenght to the carrier, I need the carrier to be shorter. Maybe the weight would be enough to slow it before it bottoms but it seems to me that an adjustable gas block is a better solution.

I can't see how that would matter as it is already hitting the buffer tube in the fire control area, the operating length won't change even if the tube is turned in one revolution

GEEZZZZ I had a double post so I deleted the wording, the double post still showed the pics so I edited just the double post and deleted all the pics Now the pics vanished from both posts. I'll just post the pics, If you cant figure out what they are ask

You can clearly see the difference in the 5.56 Tubbs spring and the .308 Tubbs spring Spacer I machined How far the carrier goes in with the spacer in place If you look really close you can see the buffer retainer pin does not come in contact with the buffer when the upper is mostly closed

double post

Actually I got a lathe, I could just turn a new bumper for the buffer that was a bit longer out of UHMW or something

$115? Nope $150.... http://www.primaryarms.com/PWS_Enhanced_Buffer_Tube_Mil_Spec_p/4btmilb1.htm

I took this pic before you posted the pics of the backs being chewed up, However here is the buffer I was using next to a regular AR buffer.

I dont think it does, But I could machine up a chunk of UHMW and push it to the back of the buffer tube, figure out how thick it had to be for the buffer bumper to hit it rather than never come in contact with the back of the tube which is happening now.

The buffer looks fine, no damage there. Its the front ears on the carrier that come in contact with the buffer boss while the buffer is a the bottom of the tube under full tention

It seems to me that if the buffer was just a wee bit longer so the bumper hit before the carrier did, which is how I thought it worked anway

Im down for the Tubb CWS. I'll order a couple up. BUT what would be wrong with putting a flat spacer in the bottom of the buffer tube behind the spring that limited the travel of the buffer to just short of coming in contact with the buffer tube boss?

I dont think so, It sure does not look like its set back

This is the spring and buffer http://www.midwayusa.com/product/988692/tubb-speedlock-systems-flat-wire-buffer-spring-ar-10-chrome-silicon http://www.midwayusa.com/product/232006/dpms-buffer-lr-308-carbine

So I took my new Aero precision rig to the range today, Fired 40 flawless rounds through it and was feeling pretty good. Got it home and opened her up to do a wipe down and WTF! The BCG was crashing into the buffer boss/tube. Id say at this point this buffer tube (which of course is a $150 PWS "enhanced" buffer tube) and the receiver are married for life. Taking them apart I think will do some damage to both. Anyway WHY?? As mentioned it is a Aero upper, Aero BGC PWS Enhanced AR-15 buffer tube (which measures 7" deep) I am using a Tubb's flat coil spring and a DPMS 2.5" buffer When I push the BCG into the buffer with the spring and buffer in place it goes all the way back to the sectional change in the carrier and hits I have a second rifle set up almost exactly the same (same spring, buffer, upper and BCG but using a UBR/rifle buffer tube and it shows marks where the carrier touched, but did not do the damage this one did.