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Posted: 9/10/2014 2:52:55 PM EDT
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I have an adjustable gas block on my 308, by have the ability to tune the gun does this mean that buying an extended buffer tube kit for my 308 is not really all that practical ? what would I gain since I can control the amount of gas going into the upper ? also if I use a regular ar15 buffer tube with 308 buffer and spring would I gain any more recoil reduction by getting just a 308 heavy buffer ? and lastly would I gain any thing by milling and making my bolt carrier lighter ? |
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I never really understood the benefit of an adjustable gas block until I built my 6.8 SPC.
My 6.8 SPC is over gassed. It would show pressure signs well before I reached maximum loads. The gun was trying to eject the casing while it was still expanded in the chamber. I've installed full auto carrier, heavy buffer, and stronger recoil spring. If I had spent just a little extra I could have just turned the gas down and would have had a little lighter gun. You can tune your gun for the loads you shoot. If you don't want to fool with a different setting for each load just pick the lowest powered load to tune with. So, with an adjustable gas block you can use the low mass carriers and buffers, but still have a gun that cycles reliable when it's tuned right. It will also allow you to lower the weight of you gun. |
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I'm no expert but, lowering your gas pressure with an adjustable gas block would have pretty much the same effect as using a heavy buffer. Both would slow the cycling rate and reduce the felt recoil. and so basically I don't need to go with the longer buffer, buffer tube and spring for my 308 build since I have the da-7 adjustable gas block, nor will I need slashes heavy buffer, how ever I think the lighter bolt carrier will be a good idea because ( correct me if I am wrong ) the lower mass will aid in less recoil and a faster lock time ? |
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In my experience Light BCG's in .308's can lead to problems like ripping the head off the case because the bolt tries to unlock to soon. It can get dangerous.
The G2 in carbine gas has this problem and we ended up stuffing the carrier with steel to bring the weight back up to std .308 carrier weight Most go with a heavier buffer/ Armalite AR10 spring to try to keep the bolt in battery as long as possible.. Then adj gas if you want try to mellow it out a bit. That's just my experience . |
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In my experience Light BCG's in .308's can lead to problems like ripping the head off the case because the bolt tries to unlock to soon. It can get dangerous. The G2 in carbine gas has this problem and we ended up stuffing the carrier with steel to bring the weight back up to std .308 carrier weight Most go with a heavier buffer/ Armalite AR10 spring to try to keep the bolt in battery as long as possible.. Then adj gas if you want try to mellow it out a bit. That's just my experience . well you have more ammo for testing then I do, glad I found out before I set it up in the mill, but it would have looked real slick if I would have milled it haha |
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In my experience Light BCG's in .308's can lead to problems like ripping the head off the case because the bolt tries to unlock to soon. It can get dangerous. The G2 in carbine gas has this problem and we ended up stuffing the carrier with steel to bring the weight back up to std .308 carrier weight Most go with a heavier buffer/ Armalite AR10 spring to try to keep the bolt in battery as long as possible.. Then adj gas if you want try to mellow it out a bit. That's just my experience . That kind of defeats the purpose of what they did with the design doesn't it? |
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In my experience Light BCG's in .308's can lead to problems like ripping the head off the case because the bolt tries to unlock to soon. It can get dangerous. The G2 in carbine gas has this problem and we ended up stuffing the carrier with steel to bring the weight back up to std .308 carrier weight Most go with a heavier buffer/ Armalite AR10 spring to try to keep the bolt in battery as long as possible.. Then adj gas if you want try to mellow it out a bit. That's just my experience . I've had excellent results with a sentry gas block, H3 buffer, armalite spring, A5 buffer tube, and full weight BCG |
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These comments make me feel better about getting the Recon!
~2475 FPS, 168SMK's, no evidence of working the brass hard. Now I'm curious as to what the gun would be like with an adjustable block...I certainly don't feel that it recoils violently, then again it's fairly heavy as-equipped at 9lbs 1oz. Maybe I'll feel different when weight is reduced a pound or so. |
| As a converse to the OP's questions... If I already have a specialized buffer then do I need the adjustable gas block? In my case, I've got a UBR stock and am using a spring one of Slash's heavy buffers but haven't bought a gas block yet. What if I want to run a suppressor on the rifle at all? |
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As a converse to the OP's questions... If I already have a specialized buffer then do I need the adjustable gas block? In my case, I've got a UBR stock and am using a spring one of Slash's heavy buffers but haven't bought a gas block yet. What if I want to run a suppressor on the rifle at all? 308 ARs seem to be over gassed to varying degrees. My two both function perfectly with what I would guess is half of the gas flow restricted by my adjustable gas block. They lock back on an empty mag, don't throw the brass 20 feet but put it all in a nice pile 4-5ft @ 2:00 or so. That is with all stock springs & buffers. Using extra mass and stiff springs can get you to the same point but it's not adjustable 'on the fly' like a gas block. If your gun functions 100% you don't "need" anything. They can make for less felt recoil and with a can, less fouling and port noise. |
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308 ARs seem to be over gassed to varying degrees. My two both function perfectly with what I would guess is half of the gas flow restricted by my adjustable gas block. They lock back on an empty mag, don't throw the brass 20 feet but put it all in a nice pile 4-5ft @ 2:00 or so. That is with all stock springs & buffers. Using extra mass and stiff springs can get you to the same point but it's not adjustable 'on the fly' like a gas block. If your gun functions 100% you don't "need" anything. They can make for less felt recoil and with a can, less fouling and port noise. Quoted:
Quoted:
As a converse to the OP's questions... If I already have a specialized buffer then do I need the adjustable gas block? In my case, I've got a UBR stock and am using a spring one of Slash's heavy buffers but haven't bought a gas block yet. What if I want to run a suppressor on the rifle at all? 308 ARs seem to be over gassed to varying degrees. My two both function perfectly with what I would guess is half of the gas flow restricted by my adjustable gas block. They lock back on an empty mag, don't throw the brass 20 feet but put it all in a nice pile 4-5ft @ 2:00 or so. That is with all stock springs & buffers. Using extra mass and stiff springs can get you to the same point but it's not adjustable 'on the fly' like a gas block. If your gun functions 100% you don't "need" anything. They can make for less felt recoil and with a can, less fouling and port noise. mine is just like above with my adjustable gas block, it shoots soft, my hk msg90 clone ( a real clone not a hack job ) had a heavy thick hk recoil pad on the msg90 stock and the heavy buffer but it still had a snappy recoil, I got used to it and shot groups no problem but this 308 is very plush... when I started the build I singled out this gas block (slr da7 ) I have never opened the gas up, just shut it off and made a few clicks fired a round and repeat until it locked the bolt back, then went 2 more clicks just to be safe for other ammos and reloads to all cycle and that was that, but I though with longer buffer tubes heavier buffers and springs and a lightened carrier that I would get less mass back and forth and have better "stay on target control" when I rotate the gun to use the off set red dot |
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That kind of defeats the purpose of what they did with the design doesn't it? Quoted:
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In my experience Light BCG's in .308's can lead to problems like ripping the head off the case because the bolt tries to unlock to soon. It can get dangerous. The G2 in carbine gas has this problem and we ended up stuffing the carrier with steel to bring the weight back up to std .308 carrier weight Most go with a heavier buffer/ Armalite AR10 spring to try to keep the bolt in battery as long as possible.. Then adj gas if you want try to mellow it out a bit. That's just my experience . That kind of defeats the purpose of what they did with the design doesn't it? I think it works pretty good in Middy gas and Rifle gas. I wouldn't know cause I turned the 24" bull barrel it came with down before I even shot it. LoL I have heard some rumblings about it tearing up brass a bit in middy form but thats it. For the most part I hear they run pretty good. Compared to my Mega it imparts a bit more recoil to the shoulder with the stock carrier. Almost like a Mosin. I guess the rifle being so light may have had something to do with it. Its a work in progress as a carbine. It functions fine now with the weighted carrier in S/A and shoots pretty soft. With a brake on it I think it would be even smoother. But in F/A it still gets a little scary. I don't want to damage myself so I'm taking my time dialing it in. 
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I think it works pretty good in Middy gas and Rifle gas. I wouldn't know cause I turned the 24" bull barrel it came with down before I even shot it. LoL I have heard some rumblings about it tearing up brass a bit in middy form but thats it. For the most part I hear they run pretty good. Compared to my Mega it imparts a bit more recoil to the shoulder with the stock carrier. Almost like a Mosin. I guess the rifle being so light may have had something to do with it. Its a work in progress as a carbine. It functions fine now with the weighted carrier in S/A and shoots pretty soft. With a brake on it I think it would be even smoother. But in F/A it still gets a little scary. I don't want to damage myself so I'm taking my time dialing it in. http://i1324.photobucket.com/albums/u601/SLRrifleworks/DSC_6552_zps695f9541.jpg Quoted:
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In my experience Light BCG's in .308's can lead to problems like ripping the head off the case because the bolt tries to unlock to soon. It can get dangerous. The G2 in carbine gas has this problem and we ended up stuffing the carrier with steel to bring the weight back up to std .308 carrier weight Most go with a heavier buffer/ Armalite AR10 spring to try to keep the bolt in battery as long as possible.. Then adj gas if you want try to mellow it out a bit. That's just my experience . That kind of defeats the purpose of what they did with the design doesn't it? I think it works pretty good in Middy gas and Rifle gas. I wouldn't know cause I turned the 24" bull barrel it came with down before I even shot it. LoL I have heard some rumblings about it tearing up brass a bit in middy form but thats it. For the most part I hear they run pretty good. Compared to my Mega it imparts a bit more recoil to the shoulder with the stock carrier. Almost like a Mosin. I guess the rifle being so light may have had something to do with it. Its a work in progress as a carbine. It functions fine now with the weighted carrier in S/A and shoots pretty soft. With a brake on it I think it would be even smoother. But in F/A it still gets a little scary. I don't want to damage myself so I'm taking my time dialing it in. http://i1324.photobucket.com/albums/u601/SLRrifleworks/DSC_6552_zps695f9541.jpg that's a bad ass piece of kit.... I though about going 14.5 or 12 but I need some barrel for "dmr" type work so nothing less then 14.5 for me but if I did just a straight aimpoint style "door kicker" type gun that rifle you got is a nice nice looking rig |
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