AR 15 Pistol need help on Buffer / spring tuning

**markshere2** · December 13th, 2018, 06:16 PM

I'm all about results at least cost / dicking around.

Immana get a heavy buffer and some other springs.

We'll see what we see.

**Emptymag** · December 13th, 2018, 06:22 PM

Originally Posted by markshere2

I'm all about results at least cost / dicking around.

Immana get a heavy buffer and some other springs.

We'll see what we see.

That makes a hell of a lot more sense than ripping apart a (likely) perfectly good gun to start drilling holes in it.

**marinville** · December 13th, 2018, 06:49 PM

Does it lock back?

**:-)** · December 13th, 2018, 06:56 PM

Originally Posted by markshere2

a.
Sorry for the unintentional obfuscation. The gun feeds and fires fine semi auto with Federal M855 ammo (62 Grain FMJ Ball)
Every other ammo turns it into a single shot that has to be cycled to fire again.
The empty brass falls very close to me.

2) thank you for the experience shared.

Lastly, thanks for the quick response to all yinz! 9 knuckleheads responding in an afternoon - Yinz needs to gets lives!!

C. Them is fun pistols when they run!!

So you are saying it ejects the case but doesn't strip off a new round from the mag?
If you load one round in the mag and shoot, does the bolt lock back on the empty mag?

**marinville** · December 13th, 2018, 06:59 PM

Originally Posted by :-)

If you load one round in the mag and shoot, does the bolt lock back on the empty mag?

Hey, I asked first... twice.

**:-)** · December 13th, 2018, 07:05 PM

A crazy question... Do you have a rifle spring in a carbine tube?

Did you buy the pistol brace or tube as individual parts or as a kit?
Thake the spring out and compare it with one of your carbine springs.

**markshere2** · December 13th, 2018, 10:15 PM

Originally Posted by marinville

Does it lock back?

Fuckifiknow. I always got pissed off at about round 3 and quit pulling the trigger.

I will test it tomorrow if I can remember and don't get distracted by trying to earn a living.

**:-)** · December 13th, 2018, 10:34 PM

What buffer spring do you have?

**marinville** · December 13th, 2018, 10:37 PM

Well, if it doesn't lock back then a heavier buffer isn't going to help.

**:-)** · December 13th, 2018, 10:45 PM

Take out the buffer spring and count the coils.

It should be 38 give or take, if it's over 40 it's a rifle spring.
You need a carbine spring. Just a shot in the dark.

If you are running a free float rail, some gas blocks are made to line up with a small gap away from the shoulder on the barrel where the handguard cap usually sits.
If you have a gas block with set screws on the bottom, one set screw hole will line up with the gas hole in the block. You can rotate it until the hole lines up with the hole in the barrel to see if you need a gap, usually you don't but I have had it happen on one of my builds years ago, half the hole was covered. If the barrel is dimpled from the factory then don't worry about the gas block alignment.

What does the brass look like, are they as shiny as new or dull and pitted?
Could be a rough chamber.

When the brass does eject, is it out in front, behind or out to the side?

You say the brass just falls close to the rifle, is the ejector plunger stuck or weak?

When it doesn't cycle does it eject the spent case then not feed another round?

Do you get a stove pipe, failure to extract, failure to eject or a double feed? What happens?

It could be a combination of problems.