AR Question

[Eric M]

A friend of mine just went out and shot his new gun he "built" on a budget. He said it fired great for 10 rounds and then wouldn't shoot every other round after that. I suggested either a bad magazine or maybe it was dirty or needed lubed (I dont think it was dirty 1st time shooting it). My only AR type experience is from the military so those were usually the problems. Any other thoughts on this? I know there are some serious AR guys on here.

[Jolten]

Had the same issue with my Grendel. If it's a brand new BCG it needs to be broken in. After about 200rounds it smoothed right out and haven't had any problems since.

[dreadi]

Are you/him sure that it’s every other round?

[CAMPMEAT]

Mine did the same thing. It was dirty.

[Biggerhammer]

More often than not. It’s one of four things.

Magazine
Buffer spring
Buffer weight
Gas flow. Gas port size/ gas port alignment.

[Eric M]

Mine did the same thing. It was dirty.

It was the first time he shot it but that was my first thought.

[Eric M]

Are you/him sure that it’s every other round?

He said the first 10 rounds were fine then it was every other round.

[Eric M]

Had the same issue with my Grendel. If it's a brand new BCG it needs to be broken in. After about 200rounds it smoothed right out and haven't had any problems since.

Be nice if that's all it is.

[Eric M]

More often than not. It’s one of four things.

Magazine
Buffer spring
Buffer weight
Gas flow. Gas port size/ gas port alignment.

Thanks. I passed this along. He said the spring and magazine were new. Is the gas port problem a simple fix if that ends up being what it is?

[CAMPMEAT]

Mine did the same thing. It was dirty.

It was the first time he shot it but that was my first thought.

Mine was not cleaned when I first got it. I just shot it and it was full of crud. Brake cleanered it and oiled it and that was all it took.....

[Eric M]

Mine did the same thing. It was dirty.

It was the first time he shot it but that was my first thought.

Mine was not cleaned when I first got it. I just shot it and it was full of crud. Brake cleanered it and oiled it and that was all it took.....

Thanks he's going to bring it over and have me show him what little I know

[yorketransport]

More often than not. It’s one of four things.

Magazine
Buffer spring
Buffer weight
Gas flow. Gas port size/ gas port alignment.

Look who's back! Should we start a count down until your next "vacation"

My suggestion was going to be either the buffer spring/weight or the gas system. They're pretty common issues with home built guns.

[b23]

More often than not. It’s one of four things.

Magazine
Buffer spring
Buffer weight
Gas flow. Gas port size/ gas port alignment.

Look who's back! Should we start a count down until your next "vacation"

Ohh now that's just mean. lol

I was going to ask if BH had to do some kind of community service or go to anger management classes as part of his road to recover program as NASCAR calls it. 

[Biggerhammer]

More often than not. It’s one of four things.

Magazine
Buffer spring
Buffer weight
Gas flow. Gas port size/ gas port alignment.

Look who's back! Should we start a count down until your next "vacation"

My suggestion was going to be either the buffer spring/weight or the gas system. They're pretty common issues with home built guns.

This last one was lame and weak. Its today’s norm, twist the definition and suppress opinions contrary to the “Twisted” definition. It's never been difficult to cipher who shoots and builds rifles and who doesn’t. 👍

[CAMPMEAT]

Hammer, did you do anything or put a different trigger in the Grendel I got from you ?

[Biggerhammer]

Hammer, did you do anything or put a different trigger in the Grendel I got from you ?

If I recall correctly, that 26” Grendel had a Rock River 2-Stage National Match trigger. Two or three builds after that one you have. I went to the CMC 2/2 flat shoe triggers.

[jdb]

Hammer, did you do anything or put a different trigger in the Grendel I got from you ?

If I recall correctly, that 26” Grendel had a Rock River 2-Stage National Match trigger. Two or three builds after that one you have. I went to the CMC 2/2 flat shoe triggers.

welcome back!!

[dreadi]

When people ask me to work on their firearms, the first thing I ask if it’s been cleaned and lubed properly. If both have been done, then yes, bring it in if it’s still not working.

My initial thought is a gas issue possibly stemming from gas block misalignment.

[Eric M]

When people ask me to work on their firearms, the first thing I ask if it’s been cleaned and lubed properly. If both have been done, then yes, bring it in if it’s still not working.

My initial thought is a gas issue possibly stemming from gas block misalignment.

Thanks. We are going to go through it this weekend. I'll update.

[CAMPMEAT]

Hammer, did you do anything or put a different trigger in the Grendel I got from you ?

If I recall correctly, that 26” Grendel had a Rock River 2-Stage National Match trigger. Two or three builds after that one you have. I went to the CMC 2/2 flat shoe triggers.

Thanks stud......

[pianoman9701]

Good to see you, BH. I had my build coated in Desert camo. Looks great.

[Biggerhammer]

Good to see you, BH. I had my build coated in Desert camo. Looks great.

I saw that. Looks great! How may rounds do you have on it now? Still shooting well? Everyone I have put together on a billet  upper has shot slightly better than most Mil-Spec forged uppers.

[pianoman9701]

Good to see you, BH. I had my build coated in Desert camo. Looks great.

I saw that. Looks great! How may rounds do you have on it now? Still shooting well? Everyone I have put together on a billet  upper has shot slightly better than most Mil-Spec forged uppers.

About 400 I think. It's very tight, 1/2" moa @100yds. I need a bigger scope for past 300, though. The 2-10 doesn't hack if for these old eyes.

[ELKBURGER]

Good to see you, BH. I had my build coated in Desert camo. Looks great.

Is there a link to your build PMan?

[pianoman9701]

Good to see you, BH. I had my build coated in Desert camo. Looks great.

Is there a link to your build PMan?

[b23]

Good to see you, BH. I had my build coated in Desert camo. Looks great.

I saw that. Looks great! How may rounds do you have on it now? Still shooting well? Everyone I have put together on a billet  upper has shot slightly better than most Mil-Spec forged uppers.

Off topic so my apologizes, but I need to do a barrel swap from 308 to 6.5CM on a new SP10 I bought and the AR10 platform is a new project for me and I need to get a vise to do the barrel swap.  Is there a particular vise you'd recommend???

[CAMPMEAT]

Good to see you, BH. I had my build coated in Desert camo. Looks great.

Is there a link to your build PMan?

Nice choice of colors John.........

[ELKBURGER]

Great camo job! Who did it? Is that a Grendel?

[pianoman9701]

Great camo job! Who did it? Is that a Grendel?

It is a Grendel and Sporting Systems sent it out for me to some guy in Gresham. I'm very happy with it.

[Biggerhammer]

Good to see you, BH. I had my build coated in Desert camo. Looks great.

I saw that. Looks great! How may rounds do you have on it now? Still shooting well? Everyone I have put together on a billet  upper has shot slightly better than most Mil-Spec forged uppers.

Off topic so my apologizes, but I need to do a barrel swap from 308 to 6.5CM on a new SP10 I bought and the AR10 platform is a new project for me and I need to get a vise to do the barrel swap.  Is there a particular vise you'd recommend???

You can get them fairly inexpensive one on EBay just do a word search for “AR10 upper receiver block”. If you don’t plan on removing and installing a bunch of barrels. If you want the best way to go about it, go with a “Reaction rod” the rod engages the barrel extension and is bullet proof when it comes to serious torque and it does not stress the receiver at all.

[b23]

You can get them fairly inexpensive one on EBay just do a word search for “AR10 upper receiver block”. If you don’t plan on removing and installing a bunch of barrels. If you want the best way to go about it, go with a “Reaction rod” the rod engages the barrel extension and is bullet proof when it comes to serious torque and it does not stress the receiver at all.

I've looked at the reaction rods and they appear to be a better, or safer, way to go and as is par for the course, they're also the most expensive too. 

Appreciate the help!

[ELKBURGER]

Great camo job! Who did it? Is that a Grendel?

It is a Grendel and Sporting Systems sent it out for me to some guy in Gresham. I'm very happy with it.

Looks great! I can see why you're so happy with it. I am working on a 6.5 Grendel now. I haven't decided if I want to try a DIY paint job or not...