The dreaded Gibbz AR10 Upper and Lower

[Nja112189]

I have a Gibbz upper on an 5.56 set up that has worked real well. I haven't shot it a ton over the last few years though. I seeked input on building an AR10 platform gun. It appears that there was a lot of negative feed back but took the big risk. Shot 40 rounds through it and no issues.

Edited November 14, 2022 by Nja112189

[Nja112189]

 

Edited November 14, 2022 by Nja112189

[DNP]

Stats?  What did you throw in the build?  

[Nja112189]

The part list is:

Gibbz g10 upper/lower, criterion 6.5cm hybrid barrel, superlative arms adjustable block, jp silent capture, triggertech adaptable trigger, prs lite stock, slr helix handguard, aero bolt. Leupold vxi lrp 6.5-20, percision armament m41 comp.

[98Z5V]

How long have you had the upper setup?  Just the Gibbz stuff?  They might have it all worked out now - this could be good news. 

[Nja112189]

I've had the upper receiver for about 4 months and finally assembled last Friday. I have the gas block wide open and mid JP spring. We have deer hunting this weekend so I just took it as a win that it functioned correctly. Will fine tune and post if I find issues. Was using the heaters hunting ammo from Cabelas.

[Armed Eye Doc]

8 hours ago, Nja112189 said:

I've had the upper receiver for about 4 months and finally assembled last Friday. I have the gas block wide open and mid JP spring. We have deer hunting this weekend so I just took it as a win that it functioned correctly. Will fine tune and post if I find issues. Was using the heaters hunting ammo from Cabelas.

Good luck with your hunt...and rifle 

[dpete]

On 11/15/2022 at 12:29 PM, Nja112189 said:

I've had the upper receiver for about 4 months and finally assembled last Friday. I have the gas block wide open and mid JP spring. We have deer hunting this weekend so I just took it as a win that it functioned correctly. Will fine tune and post if I find issues. Was using the herters hunting ammo from Cabelas.

There, fixed it for ya.  

[98Z5V]

Herters is the weakest .223 Rem ammo I've ever tried in my life.  It sucked so bad that I gave the remaining boxes away.  I just needed it for 55gr range ammo, and it wouldn't do that.

[Nja112189]

Thanks. Darn auto correct. This was 6.5 creedmoor herters ammo. Just wanted the cheapest to get somewhat sighted. I'm pretty sure I've used some 5.56 without issues.

 

[shooterrex]

What he probably meant is the herters ammo is loaded light. You turned up the gas so it will function.

NOW your gas is turned up too high for the brass ammo to function correctly. Your bolt is running to fast for the brass ammo.

Less gas or more buffer mass should get the thing running with brass ammo.

[Nja112189]

Thanks for the explanation. I will fine tune with some better ammo. I am using Herters brass softpoint ammo for this weekend to be safe.