Aagil Arms FAQ

Dear Valued Customers and Friends, 

Thank you for choosing Aagil Arms, an AR15 upper assembly builder that trusted by many.

If you run into issues with your weapon that assembled with Aagil Arms' complete upper, please kindly read the following.  

Many factors could contribute to the malfunction of an AR 15. To narrow down the root cause, you may want to go over a few questions and/or do some basic tests.

  • What lower did you use to mate with the Aagil Arm’s upper assembly? 
  • Have you used the said lower to shoot before?
  • What ammo and magazine you used to shoot when the issues occur? 
  • What type of buffer (weight) and spring do you have on the said rifle?  Are they too heavy ( or too light) for your build to cycle and eject properly? 
  • If possible, please swap with another working BCG, different brand of ammo and magazine to test out your rifle. Please swap one thing at a time so you know which item(s) would affect the outcome.

Again, we thank you for your business and hope you have a pleasant shooting experience. If you have further questions or requests please email [email protected].

Best regards,

Aagil Arms team

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What is the barrel steel?  

  4150 Chrome Moly Vanadium or 416R stainless steel. And all of our barrels are 100% US made. 

What is the finish on the black barrels?  

  The black barrels are Parkerized unless specified otherwise. We also have barrels with black nitride finish, Cerakote finish and stainless steel with black nitride finish. 

What thread pattern are each of the calibers?  

  It depends on the inventory and models. For the production we have right now the thread pitch is listed below:

  • 5.56 NATO/223 WYLDE: 1/2x28
  • 300 BLACKOUT: 5/8 x 24
  • 350 LEGEND: 5/8 x 24
  • 450 BUSHMASTER:  5/8 x 32

What aluminum alloy are the uppers?  

  Our stripped upper receivers are made out of 7075 T6 Alloy. They are 100% US made.

What ammo (grain) do you recommend for your AR15 uppers? 

For casual shooting at short or medium distance, bullet grain weight normally is not a concern. But if you do target shooting, bullet weight matters. The list below is just for reference. Please select ammos based on your needs. 

 .223 WYLDE / 5.56 NATO: 55 / 62 /69
 300 Blackout: 110 / 125 
 6.5 Grendel: 123 /130
 350 Legend: 140 / 150 / 170
 450 Bushmaster: 250 

Why do I need to do barrel break in and how?

Barrels, from expensive hand-lapped ones to low-cost massive produced ones, may all have tool marks and burr within. "Break-in" in short is to smooth out those imperfections.

You may find many different ways to do barrel break-in. It is hard to say one is better than the others. To do what is necessary for break-in and in the meantime not to overkill, it’s important to observe what your barrel tells you during the procedure regardless which method you go with. 

Products you may need for barrel break-in and cleaning: cleaning rod with Nylon brushes, gun cleaning solvents for carbon and copper fouling, patches. 

  1. Fire 5 one-shot cycles and clean the barrel after each shot.
  2. Observe copper fouling which caused by bullet jacket material. If fouling has reduced, move on to step 3. If not, repeat step 1.
  3. 1 three-shot cycle and clean.
  4. If copper fouling has reduced, move on to step 5. If not, repeat step 3.
  5. 1 five-shot cycle and clean.


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