Buis

glockrocker

Member
Dec 11, 2008
119
16
Austin, TX
Does anybody have any experience with ARMS #40 flip-up rear site? I read one guy say all the ones he has seen wobbled from left to right. I cant find any other posts confirming or damning this. Anybody whose ever oned one, please post your experience and which model it was and type of gun it was mounted on (and whether or not it had a "F" marked FSB). Thanks.
 

TSU45

Active Member
Jun 6, 2008
410
16
San Marcos, Tx
I read one guy say all the ones he has seen wobbled from left to right. I cant find any other posts confirming for damning this.
You just answered your own question. No one else has talked about that problem for a reason.

The ARMS #40 is one of the most popular BUIS. And it's not cause they "wobble" around on the receiver.
 

lonewolf23c

Active Member
Oct 2, 2008
552
16
Idaho
I don't have a civilian model rifle that uses a BUIS (Back Up Iron Sight) however, the military ones are cheap, break very easily, after a few uses will start to wobble around to the point where the sight is completely useless. They're a waste of money IMO.
 

lonewolf23c

Active Member
Oct 2, 2008
552
16
Idaho
thats discouraging. but tsu had a pretty solid point.
They don't wobble on the receiver if properly tightened down, however the parts that hold the actual sight in place wear out pretty quickly especially in dirty environments and when raised and lowered often. Also when stored the sight should be lowered to the stored position to lesson the chance of striking and breaking the sight.

The best place for advice on equipment of any type is from military personnel. If it holds up to our abuse then it will surely work for the civilian sector. However, I've had a few cases of just normal range use where the sight retainment pieces failed and left the sights inoperable.
 

TSU45

Active Member
Jun 6, 2008
410
16
San Marcos, Tx
I don't have a civilian model rifle that uses a BUIS (Back Up Iron Sight) however, the military ones are cheap, break very easily, after a few uses will start to wobble around to the point where the sight is completely useless. They're a waste of money IMO.
What sight were you using?
 

claymore504

Well-Known
Dec 2, 2008
1,647
63
Katy, TX
We used the MATECH BUIS in Iraq and it held up great for my missions. It lined up perfectly with our AimPoints as well. I put one on my AR when i got back.
 

TAZ

Well-Known
Oct 17, 2008
1,233
113
Round Rock
I have a #40L on my SPR clone. No issues since putting the thing on. It seems well built and mine does not wobble at all. I used some blue loctite to keep the mounting screws from coming loose. I have not had to abuse the rifle though so YMMV. They are back ups and get used sparingly; enough to make sure i can still hit with them but no more. The glass gets 90% playing time.
 

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