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Flaw in Briley Mag Tube rail


M4-Desert Camo
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I have the following Briley mag tube rail mount system on my stock M4.

http://www.briley.com/magazineextensionbarrelclamp-1.aspx

 

I was a the range yesterday and when tried to take things apart today to clean the M4 I discovered a flaw in their design and had a problem. When I unscrewed the Briley to take the barrel out the spring retainer cap came out (as well as the spring).

 

The oem dummy tube extension has a stop in it to hold the Spring Retainer Cap from working it's way out (see below)

[ATTACH=CONFIG]1952[/ATTACH]

 

The Briley unit does not have any kind of stop, it's unobstructed all the way to the end (see below)

[ATTACH=CONFIG]1953[/ATTACH]

 

I was able to put retainer cap back in. For the experts, does it look right? Am I missing anything? (see below)

[ATTACH=CONFIG]1954[/ATTACH]

 

Here is the Briley unit showing where the mag ends and how the rest is an unobstructed void.

[ATTACH=CONFIG]1955[/ATTACH]

 

I like the Briley unit but not if the Retainer Cap works its way out under use. Any ideas from the creative thinkers here to remedy? I was thinking about a piece of aluminum tubing cut to the right length to put inside the Briley acting as a stop. Hard part will be getting the exact length so it can be tight enough but not have the aluminum tube rattle inside.

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Does it still add two extra rounds?

 

If the mag spring retainter is falling out of the tube, take some snap ring pliers and stretch it

so it is a snug fit.

 

Edit: Sorry, I just saw that it is NOT an extention.

Edited by 12508
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Does it still add two extra rounds?

 

If the mag spring retainer is falling out of the tube, take some snap ring plier clamps and stretch it

so it is a snug fit.

 

It's not a tube extension (aka adding 2 more rounds), it just replaces the "false" OEM extension but adds two picatinny rails. I was at the range and put 85 rounds through the gun (first time since the Briley was installed). I used ring pliers to put it back, it's pretty darn tight. I just think the force of the firing process can work it out, this is why Benelli put a "stop" in place on the OEM tube so it has nowhere to go.

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