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#5570432 - 01/29/15 12:58 AM Ok all you AR10 experts
HorizonFirearms Offline
Pro Tracker

Registered: 05/05/10
Posts: 1616
Loc: College Station, Texas
Ok let me start by saying I can build a dang nice bolt gun but AR's are not my thing, looking for little advice.

I have a project sig 716 patrol that I got for fun. I have rebarreled to a longer barrel 22-243. The rifle shoots lights out but having issues getting it to cycle correctly unless I run the loads really slow which defeats the point. Is there a heaver buffer spring that I can get, or can I turn it from piston to gas block, or is there even a more fine tuned gas block for the piston system that I could get so I can get this thing cycling with the hotter loads.

scratch
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#5570598 - 01/29/15 07:54 AM Re: Ok all you AR10 experts [Re: HorizonFirearms]
FiremanJG Offline
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Registered: 12/16/08
Posts: 17893
Loc: Wolfe City, TX
I'm with you Derrick, ARs are another animal I don't have lots of experience with. The last six months I have had students and buddies at my range, their ARs quit working when I am around
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#5570719 - 01/29/15 08:52 AM Re: Ok all you AR10 experts [Re: FiremanJG]
HorizonFirearms Offline
Pro Tracker

Registered: 05/05/10
Posts: 1616
Loc: College Station, Texas
I hear ya, They are "simple" in some ways but trying to tweak them and change parts and know who's parts fit who's is a quandary. Run a 308 or 223 no prob but lets wildcat these things and run some BC and speed rifle
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#5570744 - 01/29/15 09:08 AM Re: Ok all you AR10 experts [Re: HorizonFirearms]
NTRP Offline


Registered: 02/06/09
Posts: 1421
Loc: McKinney, TX By God!
I'm not sure what kind of malfunctions you're having. But if it runs fine at slower velocities, you're system is probably over-gassed. This is actually very common. Especially when you screw a suppressor on the end of an AR-10 type rifle. I would suggest installing an adjustable gas block. Use the load it shoots best with and turn the gas down as you shoot to get just enough to make it cycle like it does with your slower rounds, or to a degree you're happy with.
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#5570751 - 01/29/15 09:12 AM Re: Ok all you AR10 experts [Re: HorizonFirearms]
ChadTRG42 Online   happy
THF Trophy Hunter

Registered: 09/16/09
Posts: 9425
Loc: Lewisville, TX
Derrick,

You will want to get an adjustable gas block to tune the amount of gas coming back to the bolt. For example, if you run an AR-10 in 308 Win at modest speeds, you have a 30 caliber barrel with about 45 grains of powder that bleeds off pressure rather quickly. When the bullet passes over the gas port, you have all the pressure space (volume area) of a 30 cal barrel behind the gas port. When you take a 22-243, you have about the same amount powder, but in a 22 caliber barrel with a much smaller area or barrel volume. When the .224" bullet passes over the gas port, you will have much higher pressures at the gas port since you have a 22 caliber barrel with the same amount of powder but a much smaller volume, which dramatically increases your port pressure. To handle the pressure, you have to reduce the gas coming back to the bolt carrier. I have seen some guys run a 6mm (243 Win or 6mmCM) or fast 22 round in a gas gun. It's hard to hot rod an AR-10. You won't get the speeds near you can in a bolt gun. You will generally lose about 100 to 150 fps, depending on a few factors. Hope this helps!

Chad
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#5570937 - 01/29/15 11:05 AM Re: Ok all you AR10 experts [Re: HorizonFirearms]
Toxarch Online   content
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Registered: 03/09/11
Posts: 1680
Loc: Parker County
An adjustable gas block should help if they make those for pistons. Way too much gas pushing the piston and cycling the bolt. Sounds like it's cycling so fast it's not letting the bullet move up in time.

You don't usually change the buffer spring, you usually change the buffer to a different weight. I THINK you need a lighter buffer for slower cycling. I think it's the lighter weight = less inertia, which leads to a shorter bolt cycle. I think that's right. (Not a pro)
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#5570946 - 01/29/15 11:06 AM Re: Ok all you AR10 experts [Re: HorizonFirearms]
bside Offline
Bird Dog

Registered: 06/10/14
Posts: 314
Loc: DFW
How heavy is your buffer?

I'm guessing you're at about 4-5oz right now -- going up to 6-7oz would probably alleviate the issue. A high power buffer/action spring (Wolff) allong with it will also help

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#5571008 - 01/29/15 11:29 AM Re: Ok all you AR10 experts [Re: HorizonFirearms]
Cast Offline
THF Celebrity

Registered: 12/14/08
Posts: 14901
Loc: North Texas - God's Country
I recommend a JP captive spring set. Smoooth
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#5571039 - 01/29/15 11:40 AM Re: Ok all you AR10 experts [Re: HorizonFirearms]
Mr. Clean Offline
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Registered: 07/27/06
Posts: 18736
Loc: Corinth, TX
Adj GB and this......www.sprinco.com

25762 Tactical Springs LLC .308 M4 CARBINE Extension Tube EXTRA POWER Moly-Plated Chrome Silicon Buffer Spring in Hard Tube (Color Coded ORANGE) [NOTE: Developed EXCLUSIVELY for .308 CARBINE Platforms Utilizing Standard 7" Depth M4 Carbine Extension Tubes with Short Buffers. E.G. DPMS/Bushmaster, Etc.]
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#5571197 - 01/29/15 12:56 PM Re: Ok all you AR10 experts [Re: HorizonFirearms]
joshbenavides Offline
Pro Tracker

Registered: 09/25/10
Posts: 1240
Loc: McKinney Tx
My sig716 has an adjustable gas block. Does yours not?

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#5571322 - 01/29/15 01:58 PM Re: Ok all you AR10 experts [Re: FiremanJG]
Big Fitz Offline
Veteran Tracker

Registered: 12/06/09
Posts: 2008
Loc: McKinney, TX
Originally Posted By: FiremanJG
I'm with you Derrick, ARs are another animal I don't have lots of experience with. The last six months I have had students and buddies at my range, their ARs quit working when I am around


This is truth!!! My 6.8 never jammed or failed to feed until JG got behind it... bang grin
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#5571332 - 01/29/15 02:06 PM Re: Ok all you AR10 experts [Re: Big Fitz]
Cast Offline
THF Celebrity

Registered: 12/14/08
Posts: 14901
Loc: North Texas - God's Country
Originally Posted By: Big Fitz
Originally Posted By: FiremanJG
I'm with you Derrick, ARs are another animal I don't have lots of experience with. The last six months I have had students and buddies at my range, their ARs quit working when I am around


This is truth!!! My 6.8 never jammed or failed to feed until JG got behind it... bang grin


Sounds like me and copiers/fax machines.
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Cast



I have a short attention spa

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#5571735 - 01/29/15 04:52 PM Re: Ok all you AR10 experts [Re: HorizonFirearms]
NTXBowfisher Offline
Veteran Tracker

Registered: 09/13/10
Posts: 2539
Loc: G-vine
adjustable gas block will do it, just did the same thing with my AR-10, you can use a heavier buffer but that's just fixing a symptom and not the problem...
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#5571991 - 01/29/15 07:20 PM Re: Ok all you AR10 experts [Re: HorizonFirearms]
HorizonFirearms Offline
Pro Tracker

Registered: 05/05/10
Posts: 1616
Loc: College Station, Texas
Thanks guys! I have currently just the factory buffer spring, not sure how heavy it is. The block is adjustable. but not really much its got on off, and suppressor. Can I convert this piston system to a gas system???
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#5572227 - 01/29/15 09:08 PM Re: Ok all you AR10 experts [Re: HorizonFirearms]
bside Offline
Bird Dog

Registered: 06/10/14
Posts: 314
Loc: DFW
Put the buffer itself on a scale and let me know the weight. That's easy enough to adjust

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