AR15 buffer tubes & weights

[RemoteDoc]

Hello all.
I'm trying to figure out why people say I shouldn't run a carbine buffer weight in a rifle length tube; with a rifle length spring.. The tube and spring are correct. And, the buffer weight is the correct weight; just shorter..
My Ruger SFAR came with exactly this setup. It has a rifle tube; a rifle spring and a carbine H2 buffer. It runs great!
I just curious what I'm missing.
I'd like to thank everyone for their time.

 

[bfoosh006]

Running a 3.25" Carbine length buffer , in a rifle length buffer will allow your BCG to smack the lower's RE threads..

The SFAR has a different length BCG , than a typical LFAR.

 

[RemoteDoc]

Running a 3.25" Carbine length buffer , in a rifle length buffer will allow your BCG to smack the lower's RE threads..

The SFAR has a different length BCG , than a typical LFAR.

Thank you. That makes sense. I asked the same question on FB. I got a lot of "No" answers. But, nobody to explain to me the "why". I appreciate you taking the time to explain it.

 

[Top O' Texas]

knowing lengths of components are key to AR's as depending on setups they change. If you have an A5 (in carbine) it uses ~3/4" longer (3.995-3.999") tube and buffer w/rifle length spring. non-A5 (don't get confused with B5) use 3.25" buffer (as stated above) w/carbine spring in the adjustable stocks (carbine). Take note as this is in AR15's about previous statements. you can use non-A5 parts in an A5 tube, but requires a spacer (3/4"). AR10's can use a similar setup in an A5 tube, but swap out the 4" buffer for the AR15 carbine buffer (3.25") and use the AR10 rifle length spring. 1 difference between the AR 10 and 15 buffer is the 15 has 3 weights and 10 has 2 which gives you more flexibility in weight adjustments (these are for adjustable weight buffers like odin and strike industries).

 

[Hesperidins]

I see @bfoosh006 already answered your question, but I thought I'd share this spreadhsheet with a bunch of AR gas system info I stumbled on today...

 

[bfoosh006]

I see @bfoosh006 already answered your question, but I thought I'd share this spreadhsheet with a bunch of AR gas system info I stumbled on today...

Nice ! Thanks for sharing

 

[Cascade Hemi]

I see @bfoosh006 already answered your question, but I thought I'd share this spreadhsheet with a bunch of AR gas system info I stumbled on today...

Do you have a link to download the sheet?

 

[Hesperidins]

Do you have a link to download the sheet?

[https]://docs.google.com/spreadsheets/d/19kzKYbkiKAEgxfd_rQwkdXuWmAESzv8p/

I put brackets around the 'https' to keep the forum software from embedding the spreadsheet into the post. You'll have to copy/paste.