What's wrong with this AR .308 lower??

[Cannonman]

A bunch of you kind folks have been doing an excellent job with trying to help me solve a problem with an AR .308 upper. Now i'm finding out that when I put this new upper on a working AR .308 everything functions fine. So I started to change things. First the buffer weight - nope. Then the buffer spring - nope. The new lower does not hold a mag as tightly as the old one. I tried some tape in a few areas with some success. But pretty much have the same problem. It does not want to strip of a round and put it fully into battery. It will pull the round and attempt to put a new round in but it only makes it about 4/5th of the way. I'd call the company that made it but there not in business anymore. This lower has a serial number of 00006. I've tried a few different mags and they all do the same. Ideas? And to all who have been trying to help me with this, Beer & BBQ anytime your near! I've learned a lot. Thanks guys!

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[theduke]

Back in the day there were 2 or more different "Pattern" mags.
DPMS...is one & kind of the standard of today.
I forget the others....perhaps Armalite...idk.

What Brand is your Lower..??

 

[slimmer13]

Go another rotation or two tighter on your mag release.

 

[matts]

I've had some problems with cheap mag releases the shoulders not cut square enough

 

[HB of CJ]

Install the mag catch assembly and run your finger down the mag well. The tit on the mag catch arm must protrude slightly into the mag well. Not level. Not below. The mag catch arm must be at least flush with the mag well and hopefully slightly also protruding.

If the mag is loose or rattles once seated the mag or lower may be out of spec. Good answers already given. You can fab up extra heavy springs to help sometimes but not a good idea. Everything must be with spec to work properly. Sometimes expensive.

Hundreds of AR15 builds.

 

[Cannonman]

Back in the day there were 2 or more different "Pattern" mags.
DPMS...is one & kind of the standard of today.
I forget the others....perhaps Armalite...idk.

What Brand is your Lower..??

MagPul

 

[AMT]

Hexmag is another. I built a 308 and wanted to try various mags. I only got a magpul and a hexmag. Both operate good. But the hexmag is TIGHT! So tight that you have to use excessive force to insert and remove. It operates but I do not like it.

 

[Member 5605]

Hexmag is another. I built a 308 and wanted to try various mags. I only got a magpul and a hexmag. Both operate good. But the hexmag is TIGHT! So tight that you have to use excessive force to insert and remove. It operates but I do not like it.

There is a ridge you can sand down to make it looser. YT has videos.

 

[AMT]

I thought about that but... the magpul's are cheaper and fit perfectly. When pushing the mag release they fall right out with no resistance.

 

[P7M13]

Too bad you ain't in the PNW, plenty of folk here would help out with an examination¹ of your AR Lower Receiver.
¹ - Had to state "AR Lower Receiver" or this would end up in the gutter quotes section....

 

[Sandaholic]

With both halves of the rifle still mated together, push the BCG as far back as it will go in the buffer tube. You should only have about an 1/8" of space between the bolt release and the bolt face.

 

[Member 5605]

@Cannonman if you toss up photos, these guys can help a lot with ID and may know something about the particular receiver.

 

[Cannonman]

The green stocks states on the box that a buffer tube spacer is NOT needed. I didn't have one so I took a spare buffer weight and put it in first. This did not fix the problem but it sure helped. The gun striped off the first and second rounds then did not put the third into battery. It seems that a 2" spacer should be used? Thought the spring for this stock is slightly longer. Yet it only seems longer because, "It's stretched"? Anyway, for all of you still working with me I can't thank you enough. It seems I'm getting close?

 

[Cannonman]

@Cannonman if you toss up photos, these guys can help a lot with ID and may know something about the particular receiver.

Thanks buddy. Very kind of you.

 

[Cannonman]

With both halves of the rifle still mated together, push the BCG as far back as it will go in the buffer tube. You should only have about an 1/8" of space between the bolt release and the bolt face.

Will be on this shortly. Thanks! If I don't get the 1/8" what Am I looking at? Thx

 

[Cannonman]

Too bad you ain't in the PNW, plenty of folk here would help out with an examination¹ of your AR Lower Receiver.
¹ - Had to state "AR Lower Receiver" or this would end up in the gutter quotes section....

Understand. No need for the grief. Thanks. Hope to visit your neck of the woods someday.

 

[Cannonman]

I thought about that but... the magpul's are cheaper and fit perfectly. When pushing the mag release they fall right out with no resistance.

Yes sir, they do.

 

[Cannonman]

MagPul

Sorry, wrong answer. It's made by "The Second Amendment." Made in Knoxville TN some 15 years or so ago. Now defunct. This lower is SN# 00006. I'm gonna guess they didn't make many more than this. I'm told it's a DPMS clone?