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Posted: 4/13/2011 11:12:32 PM EDT
i'm getting my 1st ar pistol but i  can't decide on the length? 7.5", 10.3", 11.5"....???
Link Posted: 4/13/2011 11:30:00 PM EDT
If we're talking barrels I vote 7.5" anything else I vote 13" but that's only in the morning
Link Posted: 4/14/2011 1:46:41 AM EDT
[Last Edit: 4/14/2011 1:47:11 AM EDT by CommonwealthKid]
A pistol should be pistol-length/ 7.5". If you want a substitute for an SBR, then 10.5+.
Link Posted: 4/14/2011 2:43:15 AM EDT
Originally Posted By DEERHEAD:
i'm getting my 1st ar pistol but I can't decide on the length? 7.5", 10.3", 11.5"....???
Why are you having trouble deciding? Please share your thought process with us. I went through the same thing before I bought my AR pistol but typing up my thoughts and sharing them here helped to me get things sorted out.

Link Posted: 4/14/2011 11:55:54 AM EDT
10.5 for business with a 7.5 for shits and giggles.
Link Posted: 4/14/2011 11:59:17 AM EDT



Originally Posted By CommonwealthKid:


A pistol should be pistol-length/ 7.5". If you want a substitute for an SBR, then 10.5+.


This is exactly my thoughts.  If I wanted to keep it more pistol like I's go 7.5"  Mine is 11.5" so I can Form 1 it.

 
Link Posted: 4/14/2011 12:08:17 PM EDT
For fun 7.5 is the best.
Link Posted: 4/14/2011 5:52:37 PM EDT
It was a hard decision for me between 7.5" or 10.5". I ended up ordering a 9.5" from Blackhole Weaponry instead. I'm still waiting on it, but if it doesn't work out I might go with a Daniel Defense 10.3".
Link Posted: 4/15/2011 7:58:20 AM EDT
9.5" is an interesting choice. Is it carbine or pistol length gas system? I thought 10.3" was the shortest you could go with carbine gas. FWIW, I'm going 7.5". A pistol should be a pistol was my reasoning. Now if was for a SBR lower, I would probably lean pretty hard toward a 10.5", but no SBR for me
Link Posted: 4/15/2011 10:00:38 AM EDT
[Last Edit: 4/15/2011 10:27:18 AM EDT by DEERHEAD]
Originally Posted By Matt_B:
Originally Posted By DEERHEAD:
i'm getting my 1st ar pistol but I can't decide on the length? 7.5", 10.3", 11.5"....???
Why are you having trouble deciding? Please share your thought process with us. I went through the same thing before I bought my AR pistol but typing up my thoughts and sharing them here helped to me get things sorted out.



i want the 7.5" but it seem the pistol gas system has more problem than the carbine length gas system, i like the 7.5" but i also want a reliable pistol....

I like 7.5" length but a 10.5" for reliability and velocity.
Link Posted: 4/15/2011 10:17:16 AM EDT


10.5 spikes
Link Posted: 4/15/2011 11:01:32 AM EDT
Originally Posted By louisianarebel:
https://www.aimsurplus.com/EOS/images/product/XSTU5005MOE.jpg
10.5 spikes


very nice
Link Posted: 4/15/2011 11:37:48 AM EDT
[Last Edit: 4/15/2011 11:38:02 AM EDT by AZBADBOY]
Never a single FTF or any other problem from my 7.5". Most of the "problems" you hear about are people using the wrong combination of parts. Wrong buffer (to light) and shorty buffer tubes. I find that there's a lot of people that try to assemble their own gun but have zero experience working on anything. Do the research on what works and what doesn't (the whole combination) then pick what you want. I can tell you, my combo runs like a Ferrari and you can find every last detail in the picture thread (think it's on pg32 or 33 now)

Link Posted: 4/15/2011 12:00:14 PM EDT
7.5 for pistol is my perfect length for a pistol
Link Posted: 4/15/2011 12:59:12 PM EDT
I've been at this for a couple weeks now and so I speak from experience when I say the primary purpose for AR pistols is: for "shits and giggles". That being said my short answer to the OP is "as short as feasible." Go crazy.


Link Posted: 4/15/2011 1:02:22 PM EDT
Originally Posted By DEERHEAD:
Originally Posted By Matt_B:
Originally Posted By DEERHEAD:
i'm getting my 1st ar pistol but I can't decide on the length? 7.5", 10.3", 11.5"....???
Why are you having trouble deciding? Please share your thought process with us. I went through the same thing before I bought my AR pistol but typing up my thoughts and sharing them here helped to me get things sorted out.



i want the 7.5" but it seem the pistol gas system has more problem than the carbine length gas system, i like the 7.5" but i also want a reliable pistol....

I like 7.5" length but a 10.5" for reliability and velocity.


Adams Arms makes an adjustable gas piston kit in pistol length You can see it here...http://www.youtube.com/watch?v=YXZHXtd5iVU  Even though that is a SBR and a pretty wicked one at that IMO!
Link Posted: 4/15/2011 1:57:45 PM EDT
i want the 7.5" but it seem the pistol gas system has more problem than the carbine length gas system, i like the 7.5" but i also want a reliable pistol....
I like 7.5" length but a 10.5" for reliability and velocity.
I went through the same debate and thank God Adams Arms offered the 7" bbl piston upper because it addresses the reliability concerns of a 7" bbl. As for the lost velocity, I'm not going to worry about it too much (round still travels hella fast) and eventually I will load up some Barnes 55gr TSX which will perform well out of a 7" bbl.

Here's what I ended up with.



Link Posted: 4/16/2011 12:03:58 AM EDT
[Last Edit: 4/16/2011 12:05:37 AM EDT by tnbigdawg]
Originally Posted By desertcj:
9.5" is an interesting choice. Is it carbine or pistol length gas system? I thought 10.3" was the shortest you could go with carbine gas. FWIW, I'm going 7.5". A pistol should be a pistol was my reasoning. Now if was for a SBR lower, I would probably lean pretty hard toward a 10.5", but no SBR for me


The 9.5" from Blackhole Weaponry is a pistol gas system. They use a 3 land polygonal rifling which I think I read somewhere is supposed to help with the velocity issue.


Now earlier I said I was gonna go with the DD 10.3", but I had an impulse buy today and went to Rainier Arms to pick up a 10.5" White Oaks barrel. The reason being is because I hate waiting....the 9.5" is on order, and I can't wait for a DD 10.3".....I want a barrel TODAY! So the WOA 10.5" will hold me off until I get a chance to try the 9.5".

FYI: What's nice about Rainier Arms is since I bought the BCG and barrel from them, they are going to help me headspace my upper to ensure safety...Even though I bought them at different times (albeit all parts are still new and unused).
Link Posted: 4/16/2011 9:48:06 AM EDT
Originally Posted By louisianarebel:
https://www.aimsurplus.com/EOS/images/product/XSTU5005MOE.jpg
10.5 spikes


This is what I built mine from.  Really like the length and I have had 100% reliability so far.
Link Posted: 4/16/2011 9:52:11 AM EDT
Don't know but I think 12" or 12.5" is ideal for an AR rifle.

Didn't know you could have pistols that cool in Kalifornistan.
Link Posted: 4/16/2011 2:59:28 PM EDT
i like the 7.5 for concealed carry.................!!!
Link Posted: 4/17/2011 11:17:18 AM EDT
10"+ for business if going .223/5.56

Under 10" for fun if going .223/5.56

7" and up for business or fun if going 6.8 / 300 BLK / or 7.62x39

There's also this thread on Calguns.  ATF is stating anything over 26" OAL can run a forward PG and not be considered an AOW.  This would probably require you to go with at least a 10" barrel to get you over 26" OAL if you wanted to run a FPG.

http://www.calguns.net/calgunforum/showthread.php?t=421563
Link Posted: 4/17/2011 5:55:00 PM EDT
Originally Posted By dump1567:
10"+ for business if going .223/5.56

Under 10" for fun if going .223/5.56

7" and up for business or fun if going 6.8 / 300 BLK / or 7.62x39

There's also this thread on Calguns.  ATF is stating anything over 26" OAL can run a forward PG and not be considered an AOW.  This would probably require you to go with at least a 10" barrel to get you over 26" OAL if you wanted to run a FPG.

http://www.calguns.net/calgunforum/showthread.php?t=421563
Or pin/weld the front device. My 7.5 with the PIG and RRA buffer tube is 27" Hope this works out, would be another option and benefit.
fite.

Link Posted: 4/17/2011 6:57:53 PM EDT
[Last Edit: 4/17/2011 6:58:46 PM EDT by adam731432]
The gun the ATF declared that on a "single shot" pinned mag California model. I don't know about all others.

Otherwise the RRA 10.5 is 26.5 and GTG. Or just add a rifle length buffer tube on most ar pistols but it still needs to say "other" on the 4437.
Link Posted: 4/23/2011 12:53:44 PM EDT
Since I knew I'd be going with a SBR later I did a 762x39 10.5" and I'm already jonesin' for a 7.5" which I think may start sometime next month. It will likely be run as a 22 conv upper for a while so my GF can play on it and realize what BRD/ShortBRD is so she can start working on a "cure."

The LWRC 8" PSD in 68 seems like a wonderful setup albeit expensive. If you need compactness and performance a 10.5" x39 will offer that and will likely be very inexpensive when training. Just keep your eyes open for Yugoslavian milsurp M67.

I don't regret doing a 10.5" first but be warned––-once you do a 7.5 will follow soon thereafter. Good luck on your build.
Link Posted: 5/2/2011 11:42:11 AM EDT
I'll be going with a 7.3" barrel from CMMG myself.

This was the ONLY one I could find that is 1:7 twist rate and chrome lined.  Is there a 7.5" that meets those two criteria that I have yet to find?  If anyone knows, please tell me.
Link Posted: 5/2/2011 6:40:08 PM EDT
Originally Posted By CommonwealthKid:
A pistol should be pistol-length/ 7.5". If you want a substitute for an SBR, then 10.5+.


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