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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.



Link Posted: 10/20/2016 7:35:55 PM EDT
Link Posted: 10/20/2016 7:46:15 PM EDT


"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
Link Posted: 10/20/2016 8:39:33 PM EDT
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By defendtexas:


"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
View Quote

Gimmicks strike again.
Link Posted: 10/20/2016 8:49:00 PM EDT
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.
Link Posted: 10/20/2016 9:17:09 PM EDT
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.
Link Posted: 10/21/2016 6:49:28 PM EDT
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.

Link Posted: 10/21/2016 7:09:49 PM EDT
Does it leave a dent in the brass as it is feeding?
Link Posted: 10/21/2016 7:11:08 PM EDT
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By plove:
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.

View Quote

What kind of buffer do you have?
Link Posted: 10/21/2016 7:30:53 PM EDT
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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