gravismaximus

Well I was able to test it over the weekend and..... I'm pumped it works like a champ. Was able to ammo dump a mag with no problem, haven't done that since I was in the Army 18 years ago, felt so good. Thank you for the help everyone. Now it's time to get it sighted in better, I'm only using battle sights and my groups are around 4". Ewww. Maybe it's the cheap fedral ammo I'm using?? I'll start a new post for that after I read some of the previous threads on it if I need to.

I went ahead and bought a kaw heavy buffer, 22 dsg arms + 20 for the weights. I spent 1$ more and went with the kaw on sale with free shipping at aimsurplus. I just got it tonight it weighs 5.7oz on the scale installed it and the springco. So this weekend I will find out if it was the fix. Can you get a buffer that's too heavy to the point it messes with the rifle timing?

Just tried to remove guts from my gun tec buffer to find out there are no weights. It's just a solid peice of steel. I drilled into it about 3/16 inch, differently not a cap. Bummer now I have to find a steel buffer with steel weights that I can replace with the tungsten weights I ordered. Or just buy the kak buffer.

I should receive my spring and tungsten weights this week and hopefully will be able to test it next weekend. I'll take you up on that offer survival if the heavy buffer and spring don't fix it. I measured my buffer after I calibrated my scale with the 2- 5.5 weights needed. it weighs 3.65oz . And I called gun tec. They told me my buffer was not tungsten powder filled but rather had steel weights in it. When I pulled the cap off it I see a plug inside, and nothing moves when I shake it. So do companys make buffers with weights inside that don't move?

I did read it, must have missed how you got it to 5.7 thou. You used a steel body with two tungsten weights right, that's what I'm planning to do ,so at least I'll be close. My short buffer is magnetic so it's not aluminum, must be steel. I'm going to buy a scale today to be sure on weight. If it don't work still I'll buy the kak. But how are they getting the extra .3 oz tungsten body? Anyone know about the powder question? Are the weights more dense (weigh more) I appreciate all the help 98z5v and survivalshop. I started looking into switching to a ar10 setup but it'll cost more in the end (have to buy everything recoil system again) although I'd have more options.

Ok so I ordered the orange sprinco spring and was getting ready to buy some tungsten weights to swap out to make a 5.1 oz buffer, vs the 3.8 I have now, when I recall that guntec buffer I bought was powder filled. Sure enough I took the end off buffer and there's a plug in there holding the powder in. I looked online on multiple sites looking for my buffer and found no mention of it being tungsten filled powder. Questions are, do companys make buffers with powder that's not tungsten? Is tungsten powder lighter than tungsten weights? How? It's tungsten still. More dense in a soild form? Is it better to have the inertia of moving weights in a buffer vs the filled non moving powder? The little pads that go in between the weights- are they there just to keep the weights from hitting each other (breaking), if so why isn't there one between the metal buffer case and the first weight that goes in? Don't want to buy the weights if I'm still going to end up at 3.8. thanks for the help guys.

Was just about to ask, (98 just replied) so I will about this. That's exactly what I was thinking coil count has to matter. I went and found my ar15 spring that came with my buffer tube just to see how long it is... Don't you know, it's 11 1/4 long that's really close to that 11.5 so I was going to ask if I would be safe (no gun damage) to try and see what happens with it for poops and giggles. I noticed immediately the coil count difference. For under 2 inchs longer it has 13 more coils,. There a lot closer together on this spring and I would suspect that would make it a weaker spring although it just about has the length I need. So am I correct in assuming that the spring (ar15) would allow enough room for the 308 BCG to travel back without bottoming out because it's 11.5 and less? I will get a 308 spring, just wondering.

Does coil count mean anything or is length what really matters? Obviously more coils should mean more length,. However is there springs with the same length but different coil count (more) as in attempt to make a spring stronger/ more resilient?

Ok so the spring is short, measured 9 5/8. What is that supposed to be used in? I checked my receipt and went online to look at the part number, 308-cs-10a says it's for a 308 carbine, but a closer look on the webpage at cheaper than dirt the luth-ar number changes to a L308-cs-10a down in the specs, sure enough go to the luth-ar page it's a 9.5 spring, . ugh!!! Why'd it say for a 308 carbine then???? Is that for a pistol set up? I also see spings in 12 3/4 i assume that's for a2 butt stock setups rifle length? I also see 11.5 that says carbine standard rife length, little confused there which is it carbine or rifle? What one do I need to get 11.5 like survialshop stated with a h3 buffer 98z5v said or just keep my h1. I can definitely see how a 2" short spring would not have the umph needed to close that bolt into battery, so hopefully with your help we got this figured out. Thanks

I had a gut feeling it was going to end up being a buffer, I remember it wasn't a heavy when I bought it. Now I'll have another useless buffer, (have the ar15 buffer and spring that came with the stock). I will measure the relaxed length of the buffer spring, what should it be, and was the coil count on? Please explain/ teach me as why there are two different tube lengths and what buffer length goes with what tube length and what spring length goes with each. I realize there is carbine vs rifle, is that the difference 7 vs 7 5/8? Still going to ask this again, what is the spec for magazine lips, I want to check mine. I am assuming that my 5 round magazine just has to be installed and hand cycled a 100 times to get it to work like my other magazine? Thanks for help so far

Bcg is fully assembled with no round in camber in this video. https://youtu.be/ocaPg_kRJyA it was going in before, maybe I had the charging handle out and had it picked up higher before. ha, I found it, buffer is a guntech ar10 308 caliber carbine gt-10 so the description says. bought from optics planet, sku is 2ah-rbf-gt-10

Looks like it is a 7" tube (ar15)with a 2.530" buffer (said for 308). I don't remember the weight of it and for some reason I can't find the receipt for it (I saved them all) but I do remember that it was not a heavier than normal buffer, and the one I have has the tungsten powder inside instead of the balls. It is a lr308 dpms system as far as I know/think. The extractor had 2 orings and has double springs. Which spring should I take out if I was to, the inner or outter? As for the buffer spring I count 26 coils. I do not believe I had a round in the camber while gravity dropping the bcg when it was going into battery, however it was going into battery after I installed them both as well., But tonight I tried and ist not going into battery, maybe I need more lube on the rings, I haven't lubed it in 2 weeks (haven't used it). Bcg is fully assembled with no round in camber in this video. https://youtu.be/ocaPg_kRJyA

Looks like it is a 7" tube (ar15)with a 2.530" buffer (said for 308). I don't remember the weight of it and for some reason I can't find the receipt for it (I saved them all) but I do remember that it was not a heavier than normal buffer, and the one I have has the tungsten powder inside instead of the balls. It is a lr308 dpms system as far as I know/think. The extractor had 2 orings and has double springs. Which spring should I take out if I was to, the inner or outter? As for the buffer spring I count 26 coils. I do not believe I had a round in the camber while gravity dropping the bcg when it was going into battery, however it was going into battery after I installed them both as well., But tonight I tried and ist not going into battery, maybe I need more lube on the rings, I haven't lubed it in 2 weeks (haven't used it).

Ok here's some info. Aero m5 upper, lower and bcg. Ballistic advantage gov mid length barrel 18". I have Asc magazines one 10 and one 5 round. Carbine stock with luth-ar 308 buffer spring. A carbine 308 buffer (tungsten powder) can't remember what brand. Spikes Mid length gas tube, seekins adj gas block. A little more to the story, ok so I go to fire it for the first time this spring withonly 1 round in magazine (going to set gas block), pull the changing handle and had multiple failure to feeds. It was originally a Franklin arms dfm (ASC) magazine which I have removed and gone to normal mags. Installed the 10 round magazine per NY safe act and at first had same problem on and off. So I hand cycled with no rounds in magazine 150 times, just letting it slam home. Now I don't have failure to feeds. So that helped. I have set the gas block, locks open after last shot 100% of time. So my current situation. Load magazine, pull charging handle let it slam home, goes into battery. Fire first round boom. Next round click or boom for rest of magazine. What I know is if I use forward assist it will go boom. The bolt at random 50% of time does not go into battery, the bcg is a 1/16 inch away from being fully forward. Pull trigger when it's like this you get click (hammer falling) and the bcg/ bolt finish going forward/ into battery. Round will have light primmer strike. Now I install my 5 round magazine, 90% chance it's not going into battery. This magazine is new, so it seems something in magazine needs to get broken in. I ruled out gas problem, locks back right. I did have headspace checked by two different gun Smith's (pass) Running very wet at times, makes no difference. I checked to be sure hammer does not hit lock release. Lightly sanded gas rings so bolt moves easier. Still passes bolt test Removed 1 oring from extractor Removed extractor and ejector put BCG back in to upper and hand cycled, goes into battery every time. Now if I simply let gravity let BCG fall into battery it goes 75% of time and I find the 1/16 problem, and a little push puts it into battery. So possible BCG problem or maybe need a heavy buffer? I would think I would always get a FTF if the timing of BCG was bad. Changing the magazine made the biggest difference, so that's why I was going to check the lips just to be sure there in spec. And I was going to sand the lips due to the scratches there leaving on the brass. I'm sure I've left out other things I've tried, I took a video of it doing the problem. I'll post the link. Rifle currently has 180 rounds through it. https://youtu.be/Rj-sbEY07Wg

Looking to find out info. What is the spec for the magazine lips. Also is there a preference for how high a cartridge sets in the magazine? Thanks