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Posted: 10/20/2016 6:53:26 PM EDT
Can someone point me in the right direction for things to try to solve a FTF issue (picture below).
I sort of expected this kind of thing since it's a lightweight build, just wondering what to try first. Maybe a normal carbine spring, or the Tubbs spring I have? Should I give up on the lightweight buffer and try just a carbine buffer? Relevant parts: 16" Faxon Gunner barrel, Sentry 6 adjustable block, Faxon lightweight BCG, Taccom lightweight buffer and 10% reduced spring (maybe this is problem?). I adjusted the gas up to where bolt hold open worked, and tried a few clicks beyond that as well. A single round and even two rounds seems to work fine, but normal magazine and I get a flurry of these types of FTF issues: The brass gets pretty dented up when this happens, too. 
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Posted: 10/20/2016 7:35:55 PM EDT
[#1]
That malfunction is typically known as a "bolt override" when the carrier itself is what is stripping the round.
This is caused by one of two issues: 1. The gas is not enough to cycle the weapon systems. (This is unlike in your case, as the weapon is locking open). 2. The weapon is so fast that the magazine is not being able to feed the round up fast enough for the bolt lug to push the rim and the case is catching on the carrier itself. My assumption is that the mass is so low that the cycling rate (From open to close) is so fast, the magazine is having issues. Solutions: 1. Increase the main buffer spring. Springs can help make up for lack of mass. 2. Adjust your gas down to when the weapon just locks open and only go up one click. You mentioned multiple clicks. -As the weapon is functional for some rounds, you may just be on this border. If those do not work, you have likely pushed the ragged edge of functionality of the AR-15. Go to a standard weight carbine buffer. |
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Posted: 10/20/2016 7:46:15 PM EDT
[#2]
"Designed for carbine-length buffer systems, the Taccom Ultra Lightweight Buffer reduces the primary and secondary recoil of the weapon by replacing the heavy buffer with a much lower mass buffer. The Ultra Lightweight Buffer set weighs only 1 oz (or 30 grams) and allows the recoil spring (aka buffer spring) to return the bolt carrier group into battery faster and smoother because there is less reciprocating mass. Thus giving you an overall smother running rifle and much tighter double taps and follow-up shots." Hmmmmmmmm |
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Posted: 10/20/2016 8:39:33 PM EDT
[#3]
Quote HistoryQuoted: "Designed for carbine-length buffer systems, the Taccom Ultra Lightweight Buffer reduces the primary and secondary recoil of the weapon by replacing the heavy buffer with a much lower mass buffer. The Ultra Lightweight Buffer set weighs only 1 oz (or 30 grams) and allows the recoil spring (aka buffer spring) to return the bolt carrier group into battery faster and smoother because there is less reciprocating mass. Thus giving you an overall smother running rifle and much tighter double taps and follow-up shots." Hmmmmmmmm Gimmicks strike again. |
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Posted: 10/20/2016 8:49:00 PM EDT
[#4]
Close the gas block down to where it just functions and see if that cures the problem. I'm running an empty buffer and have not had any issues. You just don't have the gas set correctly.
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Posted: 10/20/2016 9:17:09 PM EDT
[#5]
Excellent, I will try both things. I did indeed possibly dial the gas up a bit high, I think I skipped a click and may have added an extra when I got it to BHO a few times.
I will probably also try a normal carbine spring to make up for lost mass as suggested. I don't want to be marginal - this isn't a life or death gun or anything but I'd like to have it 99.9%. If those fail I'll go ahead and move to a carbine buffer, it's only a few oz difference. |
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Posted: 10/21/2016 6:49:28 PM EDT
[#6]
I found the issue. It's something I like to call PEBGAC - problem exists between gun and chair. Namely me being a dummy and not checking the obvious.
It was apparently my magazine. I only brought two mags, one unloaded to single-shoot to dial in gas, and one loaded to shoot once I got that working. The "loaded" mag (pmag) has some sort of issue. I changed to Tubbs spring and it still jammed. So I loaded up my other pmag and it fed perfectly. Freaking sweet. Now anyone have a suggestion for the ideal spring to keep in? I have a Tubbs (in now), Red Sprinco, Carbine, and 10% reduced carbine to choose from. Do heavier springs lend to more reliability even in a lightweight bolt/buffer scenario? I guess I'll just keep the Tubbs in for now since it looks like it works. |
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Posted: 10/21/2016 7:09:49 PM EDT
[#7]
Does it leave a dent in the brass as it is feeding?
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Posted: 10/21/2016 7:11:08 PM EDT
[#8]
Quote HistoryQuoted:
I found the issue. It's something I like to call PEBGAC - problem exists between gun and chair. Namely me being a dummy and not checking the obvious. It was apparently my magazine. I only brought two mags, one unloaded to single-shoot to dial in gas, and one loaded to shoot once I got that working. The "loaded" mag (pmag) has some sort of issue. I changed to Tubbs spring and it still jammed. So I loaded up my other pmag and it fed perfectly. Freaking sweet. Now anyone have a suggestion for the ideal spring to keep in? I have a Tubbs (in now), Red Sprinco, Carbine, and 10% reduced carbine to choose from. Do heavier springs lend to more reliability even in a lightweight bolt/buffer scenario? I guess I'll just keep the Tubbs in for now since it looks like it works. What kind of buffer do you have? |
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Posted: 10/21/2016 7:30:53 PM EDT
[#9]
It was leaving a dent in the brass with the 'bad' magazine when it jammed. Now it's shooting great (so far).
I have a lightweight buffer (the Taccom) and bolt with adjustable gas, I think I have the gas pretty well dialed in. Just wondering if the Tubbs spring I have is ideal for this lightweight setup. |
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