A2 buttstock tube not reaching retainer spring 5.56

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YYC_Gun_dude

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We have screwed on the buffer tube from an a2 buttstock and the threads are a full turn short of reaching the buffer retainer, the receiver is a lockhart tactical raven 5.56, it's almost like the hole was machined too far in or something?

can we run without retainer? the only problem i can think of is whenever opening to clean the buffer spring will fall out
 
You just said it's a full turn short of contacting the edge of the buffer retainer. Turn it in another turn! If that's not enough, two turns!
The thread pitch was chosen in this design so that in all circumstances the receiver extension can be turned in enough to hold the buff retainer, but not so much that it would contact the tip of the retainer.

Addition:
Yes, the buffer can be installed and run without the retainer. Close it up carefully and it will work. Until you need to pivot open the mess again. But it can be shot that way.
 
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Cocked&Locked said:
You just said it's a full turn short of contacting the edge of the buffer retainer. Turn it in another turn! If that's not enough, two turns!
The thread pitch was chosen in this design so that in all circumstances the receiver extension can be turned in enough to hold the buff retainer, but not so much that it would contact the tip of the retainer.
Click to expand...

FYI-
per the OP's title-A2 buttstock tube-
An A2 Rifle buffer tube has a shoulder in the design that is tightened up to the receiver.
aka...No... M4 carbine tube nut.
 
I've got a rifle that doesnt have the buffer retainer pin installed. Its fine. Just stick your finger in when opening the receivers to stop the buffer jumping out.
 
Cocked&Locked said:
You just said it's a full turn short of contacting the edge of the buffer retainer. Turn it in another turn! If that's not enough, two turns!
The thread pitch was chosen in this design so that in all circumstances the receiver extension can be turned in enough to hold the buff retainer, but not so much that it would contact the tip of the retainer.

Addition:
Yes, the buffer can be installed and run without the retainer. Close it up carefully and it will work. Until you need to pivot open the mess again. But it can be shot that way.
Click to expand...

sorry wasn't clear it's in as far as it can go but still about a full turn short
 
DANS40X said:
FYI-
per the OP's title-A2 buttstock tube-
An A2 Rifle buffer tube has a shoulder in the design that is tightened up to the receiver.
aka...No... M4 carbine tube nut.
Click to expand...

yup it's different than adjustable it's a full stock you remove back screw and slide the tube out, screw tube in, slide stock back over, there's a lip at the end of the threads so i can't turn 1 more turn.

I don't think there's a solution without making a mod.
 
CobraGT said:
I had the same problem on one of my Modern Sporter receivers. I don't think there really IS a solution, save going with a different buffer tube.
Click to expand...

damn, so the a2 buffer tubes don't come with different length threads? there's no chance i got a cheap omade in china buttstock that doesn't meet specs?

ok i'm just going to go without the retainer and deal with buffer popping out when i open the upper cleaning.
 
OP,
Take a couple measurements-
Tube end to forward face of buffer tube shoulder.
Receiver to aft end of buffer retainer pin.
Answer-

Simple math
Face the forward surface of the buffer tube shoulder in a lathe.

Time spent <10minutes.
Done w/o any Bubba manipulations required.
 
DANS40X said:
OP,
Take a couple measurements-
Tube end to forward face of buffer tube shoulder.
Receiver to aft end of buffer retainer pin.
Answer-

Simple math
Face the forward surface of the buffer tube shoulder in a lathe.

Time spent <10minutes.
Done w/o any Bubba manipulations required.
Click to expand...

^^^ I absolutely agree, now that I understand the problem better.

Snug the tube in place. See how much further it needs to go to retain the buff stop. A dial caliper is what you need here, or a set of gauge blocks.

Lets say it needs to go another .025 more. As was stated, put in a lathe and face .025 from the front of the tube shoulder. Fast and easy.

If you were close to me I'd do it in 10 minutes for you. Calgary has lots of machinists.
 
Last edited:
DANS40X said:
OP,
Take a couple measurements-
Tube end to forward face of buffer tube shoulder.
Receiver to aft end of buffer retainer pin.
Answer-

Simple math
Face the forward surface of the buffer tube shoulder in a lathe.

Time spent <10minutes.
Done w/o any Bubba manipulations required.
Click to expand...

This is not ideal either as it will leave a gap where the stock meets the rear of the tube's shoulder.
 
propliner said:
This is not ideal either as it will leave a gap where the stock meets the rear of the tube's shoulder.
Click to expand...

It will NOT change the dimension from the AFT surface of the shoulder to the AFT end of the buffer tube.

The FORWARD face of the A2 buffer tube shoulder is what is preventing the tube to be threaded into the receiver.

A simple measurement
Simple mathematics
Simple lathe facing
10 minutes
Done

Far from Rocket Science....for some!!

FYI-
An A1 buffer tube & stock are shorter that an A2 stock.
A2 stock on an A1 tube requires a spacer install prior to sliding the stock onto the tube.

An A5 tube &/or stock will confuse the gallery...so I won't go into details.
 
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