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Posted: 4/17/2015 7:38:45 PM EDT
[#1]
Longer is better, so 14.5". Then 12.5", and so on.
I run a suppressed 12.5" for home defense - overall length is similar to an unsupressed 16" rifle, and function was 100% right out of the gate. |
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Posted: 4/17/2015 7:52:48 PM EDT
[#2]
I think I had really good luck but both my 12.5" and 7.5" ran perfectly from round 1. I did a lot of reading on here to make sure I knew how to get them running right and it worked. I have to imagine the DD Mk18 upper, ordered complete from DD, would run perfectly out of the box. I have several of their uppers (including my 12.5") and they are top-notch. The Mlk18 may very well be my next purchase.
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Posted: 4/17/2015 7:57:35 PM EDT
[#3]
Quote HistoryQuoted:
Longer is better, so 14.5". Then 12.5", and so on. I run a suppressed 12.5" for home defense - overall length is similar to an unsupressed 16" rifle, and function was 100% right out of the gate. Thanks for the reply. I was just hoping not to spend a bunch of cash buying buffers and springs, etc. to get it to run correct. 12.5 is probably as long as I would want to go, so I am going to check out some uppers in that length. Looking into a direct thread Trek for this rifle, what can do you use? |
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Posted: 4/17/2015 7:59:26 PM EDT
[#4]
Quote HistoryQuoted:
I think I had really good luck but both my 12.5" and 7.5" ran perfectly from round 1. I did a lot of reading on here to make sure I knew how to get them running right and it worked. I have to imagine the DD Mk18 upper, ordered complete from DD, would run perfectly out of the box. I have several of their uppers (including my 12.5") and they are top-notch. The Mlk18 may very well be my next purchase. Ok thank you that is good to know. The DD is expensive, but I figured it might be GTG out of the box, so that is why it has me interested. |
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Posted: 4/17/2015 8:02:22 PM EDT
[#5]
My 11.5" BCM upper has run flawlessly so far.
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Posted: 4/17/2015 8:05:23 PM EDT
[#6]
The only sbr I've ever personally need have trouble running was a 7.5". Everything from 10.3" has always run well with and without a can. I would have no problem relying on a 10.3"
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Posted: 4/17/2015 8:41:36 PM EDT
[#7]
Quote HistoryQuoted: My 11.5" BCM upper has run flawlessly so far. +1 |
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Posted: 4/18/2015 6:27:19 PM EDT
[#8]
11.5, 100% out of the gate.
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Posted: 4/18/2015 7:01:37 PM EDT
[#9]
I agree with 11.5". I deployed with a 10.3" and would trust most of the civilian variants, but there is a pretty good gain in velocity between the 10.3 and 11.5"
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Posted: 4/18/2015 7:44:27 PM EDT
[#10]
If you're going to spend the $200 tax stamp to SBR I would go minimum 10.5"
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Posted: 4/18/2015 7:58:10 PM EDT
[#11]
11.5", then get a second upper in 14.5", like I did.
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Posted: 4/18/2015 8:54:22 PM EDT
[#12]
My 10.5" has always run perfectly, suppressed or unsuppressed, with every ammo and buffer combination I've ever tried. Same for my 14.5" and 20".
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Posted: 4/19/2015 12:02:57 AM EDT
[#13]
I have a half dozen 10.5's so I'm partial. Had a 12.5 but after adding a can, I felt like I may as well stick with a 16 inch since it felt long still...
I like 7.5 but after shooting one, I felt it was obnoxiously loud and is not recommended for most cans out there, since the gasses are still burning, it takes a toll on the blast baffle |
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Posted: 4/19/2015 2:06:53 AM EDT
[#14]
Buy a Vltor A5 buffer system and good upper from a good manufacturer and you won't have to worry about getting it running. 7 inch, 10 inch, 12 inch, 14 inch.. doesn't matter as long as you buy smartly.
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Posted: 4/19/2015 5:39:07 AM EDT
[#15]
Quote HistoryQuoted:
11.5, 100% out of the gate. ^^This^^ |
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Posted: 4/19/2015 12:08:22 PM EDT
[#16]
I built my own 7.5 upper and it's been 100% about 500 rounds of steel case and 100 of brass with my form1 can.
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Posted: 4/19/2015 9:29:21 PM EDT
[#17]
I built an 11.5" for my first and have had no issues.
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Posted: 4/19/2015 10:51:09 PM EDT
[#18]
Quote HistoryQuoted:
I built an 11.5" for my first and have had no issues. Getting ready to build my 11.5. Are you running standard gas block or adjustable? |
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Posted: 4/20/2015 6:15:32 AM EDT
[#19]
The reason shorter uppers are more finicky is due to the shorter dwell time which results in less gas available to reciprocate the bcg. If you plan on running a Gemtech Trek, you will get additional back pressure which will give you all you need to reliably cycle your bcg.
I have a Gemtech Trek on a 10.5" barrel which has been 100% reliable. I also have a titanium YHM that I run on an 11.5" that has been flawless as well. The 10.5" has a FSB and there's very little blowback. I run a Syrac adjustable on the 11.5" because the can is QD. |
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Posted: 4/20/2015 10:50:58 AM EDT
[#20]
I have never built an SBR that has ever had problems...YMMV
Quality components = quality build. |
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Posted: 5/1/2015 5:31:55 PM EDT
[#21]
11.5" is the answer to your question. Be sure to mate it with a BCM KMR rail.
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Posted: 5/1/2015 8:40:47 PM EDT
[#22]
Quote HistoryQuoted: I have never built an SBR that has ever had problems...YMMV Quality components = quality build. |
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Posted: 5/1/2015 9:04:10 PM EDT
[#23]
My LMT 10.5" runs like a top with and without a can.
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Posted: 5/1/2015 9:09:07 PM EDT
[#24]
Both 11.5" and 10.3,10.5" have run perfect without any special buffers etc.
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Posted: 5/1/2015 9:46:03 PM EDT
[#25]
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Posted: 5/1/2015 10:00:33 PM EDT
[#26]
My 11.5 ran fine from the start. H3 buffer. Suppressed and unsuppressed like a top.
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Posted: 5/2/2015 9:12:09 AM EDT
[#27]
I have a 7.5" SBR that I never have had an issue with. I use a RRA barrel, H2 buffer, and KX3. It worked the same with and without the KX3.
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Posted: 5/2/2015 10:17:40 AM EDT
[#28]
I have a MK18 from DD.
keep in mind they're over gassed from the factory. Love mine. I highly suggest a govnah adjustable block if you're going to run it suppressed. I'm building another 10.3" build off the DD barrel and I'll probably build a 12" soon after. |
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Posted: 5/3/2015 9:20:58 PM EDT
[#29]
Quote HistoryQuoted:
11.5" is the answer to your question. Be sure to mate it with a BCM KMR rail. |
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Posted: 5/3/2015 11:12:41 PM EDT
[#30]
I'm pretty new to the SBR world but I prefer 11.5", personally.
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Posted: 5/4/2015 9:39:06 AM EDT
[#31]
11.5" is my favorite length in general. Factory velocity w/ Federal m193 is 2911fps out of an 11.5" and 2991fps out of a 14.5". The extra length is not worth the 80fps to me.
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