AR15.Com Archives
 Matech buis issue - bolt snapped.
chosos  [Member]
8/18/2011 7:57:06 PM
I picked up a NIB matech buis and upon installation, the bolt snapped. It was still fairly easy to turn, so I cant believe i overtightened it. Now, - I'm worried that it was a copy. Iit came in a blue sealed pack: http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=110728797734

I have 2 other Matech buis, and to be honest, they look identical.

Does matech warranty these? Worst case - is there somewhere i can buy a replacement bolt for it?

I think there's enough sticking out to where i can dremel in a notch and remove it with a flathead screw driver.
Paid Advertisement
--
RonCameron  [Member]
8/18/2011 8:19:35 PM
http://www.battlearmsdevelopment.com/badbsm.php
fuzzy03cls  [Member]
8/18/2011 8:58:48 PM
Looks legit. That paper inside should have been the zero instructions.
Lancelot  [Moderator]
8/18/2011 9:12:04 PM
Originally Posted By RonCameron:
http://www.battlearmsdevelopment.com/badbsm.php




This. The stock mounting screws are known to break.
chosos  [Member]
8/19/2011 6:43:07 AM
i got the seller to send me another bolt. I'm trying to keep this as close to cost as i can. so, are the stock bolts known to shear off once its installed? or only upon installation?

Lancelot  [Moderator]
8/19/2011 7:40:56 AM
Originally Posted By chosos:
i got the seller to send me another bolt. I'm trying to keep this as close to cost as i can. so, are the stock bolts known to shear off once its installed? or only upon installation?




The problem seems to be on installation. You overtighten the bolt and it will shear. The BAD unit is worth every penny. The bolt is stronger and the plate is stronger. And don't forget the loctite.
3XIraqvet  [Member]
8/19/2011 8:47:24 AM
Used to see a few Matech sights sitting around the armory waiting for new bolts. One of the armorers told me that the bolt off the mount for AN PEQ-2 works. I've never tested that claim. The only problem I had with this sight is that the dimple that keeps the sight down wears down after a while and suddenly your aperture starts popping up when you fire.
chosos  [Member]
8/19/2011 9:23:55 AM
Originally Posted By 3XIraqvet:
Used to see a few Matech sights sitting around the armory waiting for new bolts. One of the armorers told me that the bolt off the mount for AN PEQ-2 works. I've never tested that claim. The only problem I had with this sight is that the dimple that keeps the sight down wears down after a while and suddenly your aperture starts popping up when you fire.


^ this is an issue. ive seen this issue on multiple matech's on ebay that were going for ~$20 bucks. the fix - one of those black girlie hair rubber bands - it keeps it locked in place and still allows it to function.

i wish they'd update the design so that the dimple was a non-issue.



my issue:
the bolt on mine snapped with very little torque - which is why i am so appalled. the head was still freely moving and then BAM - snap. I'm really glad the seller is going to ship me out a new bolt. i'm also going to home depot later to see if i can source another bolt.

if i can avoid spending another $20 on a bolt, I will. Its not worth it for me to invest in a $20 bolt for a $40 sight.
Kirch  [Team Member]
8/19/2011 10:37:31 AM
Originally Posted By RonCameron:
http://www.battlearmsdevelopment.com/badbsm.php


Go with the above and it will fix it right up.
Duffy  [Dealer]
8/19/2011 10:06:50 PM
Thank you guys for the vote of confidence.

This is one of the products we made because there was a need for a better bolt and bracket for a very good backup sight that's somewhat hampered.

Over the years there had been individual efforts at making a stronger bracket. We identified the problem, and it wasn't the bracket but the bolt. It has an over sized head and skinny screw body, it requires a wrench way larger than needed to torque the bolt, but the screw body isn't proportional to its head, overtorqing is usually the result unless you read the manual.

While we were at it, we redesigned the bracket to be more than twice as thick, and counter sunk the screw hole on the bracket.

The bolt we use is rated Grade 8 (same grade of screws used on gas key).

Please note that our bolt is incompatible with the factory bracket, and the factory bolt is incompatible with our bracket. In this case, the loss of backward compatibility is overlooked in order to make everything strong

Jayg0351  [Member]
8/19/2011 10:55:56 PM
I just got my MATECH in the mail today and the bolt head stiriped out so I had to use pliers to tighten it down. I can see one for the BAD kits in my future. If for anything I would like to have it as spare part.
StrkAliteN  [Life Member]
8/19/2011 11:10:59 PM
OST
chosos  [Member]
8/19/2011 11:52:01 PM
a grade 5 bolt should be suitable for this application - the bolt should snap before the threads are stripped out of the BUIS. my dilema is that the stock bolt failed when the head was still moving with relative ease. In fact, I picked up a replacement 6-32 bolt from Home Depot and the sight went on with no issue.

the stock rail piece should also be suitable for the typical application. Like I said initially, I'm not after a $20 part to replace a $0.15 1 1/4" 6-32 grade 5 bolt. This isn't to say the additional part is not a solid fix or a worthy investment - I'm sure the quality is superb.
Paid Advertisement
--