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Posted: 8/21/2016 7:52:08 PM EDT
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Does anyone know off hand or can they measure a 9mm specific buffer?
I've read posts where guys are using a stack of quarters, usually 13 so I guess I could measure the quarters and ad that to the length of a standard buffer? I'm wondering if there's any reason I can't cut down a rifle buffer? |
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I'm going to make a Delrin spacer for my 9mm CMMG. I did not measure the buffer legth. But the distance the bolt moved past the Bolt hold open was one inch. So I'll make a 1" long spacer so the bolt stops just past the bolt hold open latch. Sounds about right. I measured 13 quarters @ just under 9/10ths inch (.870" to be exact) I measured a standard carbine length buffer @ 2.850" without the bumpers so I'm thinking 3.720" So about 2 7/8" vs. 3 3/4" |
for the DIY types... relationship between carbine, 308, and 5.56 rifle buffers and carbine length and rifle length buffer tubes... it appears that a rifle buffer body can be shortened about 1" or so retaining the full length elastomer buffer... if you cannibalize a couple of H3 buffers, you should be able to make an H5, possibly needing to remove a rubber spacer or so...I'll try to get a weight on a rifle buffer filled with lead shot when I get a change...shown with a NFA modular bolt
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| JoshV... is the Tubb buffer heavier than a standard 5.4oz rifle buffer? have you done any trials as to the amount of scope (dot) movement with different weight buffers?... I get less movement with the 3 port comp clocked to 11:00 and not 13:00 as with my 5.56 carbines... my 1/2" brass rod insert gives my a 6.2oz rifle buffer |
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I think its better to use quarters with a regular buffer than to use a buffer with a longer stem. I'm using a 2ft long Tubb .308 buffer *spring with 13 quarters as a spacer and I still get lockback. Better to add more spring tension. For all practical purposes, there is nothing different about using a longer buffer or adding quarters/1" spacer assuming the same spring. All the quarters/spacer do is preload the spring - they do not change the spring rate (i.e. tension). |
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Does anyone know off hand or can they measure a 9mm specific buffer? I've read posts where guys are using a stack of quarters, usually 13 so I guess I could measure the quarters and ad that to the length of a standard buffer? I'm wondering if there's any reason I can't cut down a rifle buffer? I don't know why you guys continue to use a heavy stack of quarters, or guessing at buffer lengths. And spring preload ??? This ain't a dirt bike guys. All you are trying to accomplish is shortening the stroke in a efficient and effective manner. I've had really great luck with using a 5 - 5.5 oz buffer, the NFA buffer bumper, and a regular carbine spring. And it also works well with the rifle buffer, rifle spring, and buffer tube set-up. In both set-up's, it does seem to lessen the recoil too. And weighs nothing. This set-up has run flawless with 115grn at over 1400fps....as well as 165grn at 850fps. 16" barrels down to 8" barrels....different lowers, bolts, and mags. (colt/glock) I've put them in a dozen guns without a single issue in any 9mm PCC build. Don't wanna buy a NFA buffer bumper....go buy a solid rubber or polyurethane cork and trim it down to fit. But using quarters....man, that is so bubba, and saves what, $4-$7 over buying a known product that works. And all that extra work cutting stuff down, bubba-fixing a rifle buffer... 
Bumper buffer with carbine tube, carbine spring, 5oz-5.5oz buffer, or rifle tube, rifle spring, rifle buffer Simple, effective, cheap, easy, and it works. http://www.schuylerarmsco.com/product.kak-9mm-buffer-993 https://newfrontierarmory.com/shop/blowback-buffer-spacer/ . |
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78 CJ... have you tested it to determine the least amount of scope shake?... all of my trials work, I'm just trying to keep the dot on target at 25yd I don't pay scope shake much mind...... 
Here is a gopro PCC gun (8" barreled 9mm AR "pistol") view...  https://www.youtube.com/watch?v=a89q0IZvpvs
IKAM footage 14.5" barreled 9mm PCC https://www.youtube.com/watch?v=TEb0JO2gpFg
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Seems to me the best setup recoil wise would be to forego lrbho and use the heaviest standard length buffer with a heavy spring?
The more the buffer can travel before it hits the rear of the buffer tube would seem to be better and the slower it's going when it hits the better? Spacer and longer buffers shorten that travel but it seems it's necessary to keep from beating the bolt catch to death Also I noticed a rifle buffer cut down will compress the spring more because of where the spring sits on the buffer. Shouldn't be much more compression than you would get with a stack of quarters Eta: I've read where guys go light with the bolt and buffer to reduce recoil. That make sense but I have trouble believing it doesn't beat up on the FCG and pins |
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Seems to me the best setup recoil wise would be to forego lrbho and use the heaviest standard length buffer with a heavy spring? The more the buffer can travel before it hits the rear of the buffer tube would seem to be better and the slower it's going when it hits the better? Spacer and longer buffers shorten that travel but it seems it's necessary to keep from beating the bolt catch to death Also I noticed a rifle buffer cut down will compress the spring more because of where the spring sits on the buffer. Shouldn't be much more compression than you would get with a stack of quarters Eta: I've read where guys go light with the bolt and buffer to reduce recoil. That make sense but I have trouble believing it doesn't beat up on the FCG and pins Felt recoil is a "perception" thing. One person may perceive a slow, push type recoil to feel less/better than a quicker, sharper recoil or vice versa. Typically, the more mass you have moving, the more it will affect the movement of the firearm. You can also change the perceived recoil by shooting different weight bullets at different velocities. A heavier bullet moving at a slower speed tends to feel like it has less recoil than a lighter bullet moving at a faster speed - from the same gun. Just check out what the gamers do with competition handguns and loads and such. Best thing to do is just try different stuff to find what works best for you. Quarters vs delrin spacer vs longer buffer vs whatever doesn't matter - pick one or try them all and see what works best for you. Action springs are constant rate, so spring compression doesn't really matter as long as the spring isn't stacking/binding up. |
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I don't know why you guys continue to use a heavy stack of quarters, or guessing at buffer lengths. <snip> . Quoted:
Quoted:
Does anyone know off hand or can they measure a 9mm specific buffer? I've read posts where guys are using a stack of quarters, usually 13 so I guess I could measure the quarters and ad that to the length of a standard buffer? I'm wondering if there's any reason I can't cut down a rifle buffer? I don't know why you guys continue to use a heavy stack of quarters, or guessing at buffer lengths. <snip> . Super helpful Thanks |
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Quoted:
Does anyone know off hand or can they measure a 9mm specific buffer? I've read posts where guys are using a stack of quarters, usually 13 so I guess I could measure the quarters and ad that to the length of a standard buffer? I'm wondering if there's any reason I can't cut down a rifle buffer? Colt 2 piece mechanical 9mm buffer measures at 3.270" Spike's Tactical ST-9BS 9mm buffer spacer measures at 0.875" Combined Colt buffer+ST-9BS spaces = 4.145" Spike's Tactical ST-9X extended 9mm heavy buffer measures at 4.120" |
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Quoted:
I think its better to use quarters with a regular buffer than to use a buffer with a longer stem. I'm using a 2ft long Tubb .308 buffer *spring with 13 quarters as a spacer and I still get lockback. Better to add more spring tension. Got the Tubb spring I think it's actually closer to 30" 
It's not too easy to get that sucker all stuffed in there. So far with limited testing it seems to really tame things down. Recoil seems smoother |
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