Serious feeding problem and sighting in issue.

[Steelpanther86]

Two questions. 1. Does all Grendels suffer feeding issues, my rifle either will jam or just won't properly feeding after every shot. 2. I used Hendershots custom ammo and took a deer with it and tried factory ammo Hornady 123g set and I'm dead center at 25 buy at 100 I'm all over and to the left and this is while using a shooting rest. So is it my grendel don't like Hornady or a barrel problem or maybe my shooting rest isn't heavy enough like I maybe need a Caldwell lead sled.

[sundowner]

Could be the mags or lose scope .

[ETEX HUNTER]

I have never had feeding issues with a Grendel. I have built a few. magazines would be my first thought on feeding. accuracy issues could be many things. scope properly install would be my first thought.

[Klem]

Steel,

Yes, Grendel has a history of magazine issues which you can find by using the Search function. There are a number of fixes and it's hard to say which one your gun needs. Fixes include:

1. Change mag brand.
2. Tighten mag latch/release mechanism.
3. Polish the mag lips, play with the angle of the lips to present the bullet nose higher.
4. File the feed ramps wider and deeper. This includes the anodising on the lower so the ramp into the extension is seamless. A Dremel works best here.
5. Change ammunition or play with the OAL if you reload.

The strange groups could be because your bullets and their tips are getting dinged from the violent feeding. If they are all off in a particular direction to where you were aiming then likely some other issue. Could be your shooting technique, the build, and of course the scope. Are you using a suppressor?

[LR1955]

SP86:

Let me add this to the mix.

Sometimes AR-15 makers use M-16 feed ramps. The Grendel uses an M-4 feed ramp. Yes, it makes a difference and what you describe indicates that the feed ramp in your blaster may be for an M-16.

By all means, check the magazine latch to make sure it is tight.

Good luck screwing around with magazines. Better bet is to buy a different brand and see if it works.

IF your ammo fits in the magazine with a little space between the tip and front of the magazine, AND it feeds and extracts without problems, most likely your ammo is the right length for function.

Good possibility the Hornady ammo has a different POI than the other ammo you used so having the Hornady stuff group in a different location probably isn't an issue.

Buying a new rest will not solve your problem.

If it was made by a reputable company, you ought to call them and get their advice too.

If it was bodged together by someone in their basement using parts made by unknown companies, then you got your work cut out for you.

LR-55

[VASCAR2]

More specific information on your build might help us diagnose a potential problem. Barrel length, gas port location (carbine, mid length, Rifle length), fixed gas block, adjustable gas system, suppressor in use, buffer and spring in use. The key elements to an accurate AR-15, quality barrel, good trigger and good optic/sights. It is also helpful to know which specific magazine your using in your 6.5 Grendel.

[LRRPF52]

Two questions. 1. Does all Grendels suffer feeding issues, my rifle either will jam or just won't properly feeding after every shot. 2. I used Hendershots custom ammo and took a deer with it and tried factory ammo Hornady 123g set and I'm dead center at 25 buy at 100 I'm all over and to the left and this is while using a shooting rest. So is it my grendel don't like Hornady or a barrel problem or maybe my shooting rest isn't heavy enough like I maybe need a Caldwell lead sled.

[just_john]

Have you checked to be sure your barrel is straight with the receiver? And, is it tight in the receiver?

[montana]

https://www.arbuildjunkie.com/ar-15-feed-ramp-problems-school-of-the-american-rifle/

This is how you do proper feed ramp work..

https://www.youtube.com/watch?v=Kxz8teLbEPc

[LRRPF52]