Magpul MBUS polymer front sight hasn't melted yet...

[js_paddle07]

You may have answered your own question. Is the rail a Picatinny (MIL-STD-1913), or is it Weaver mount? They are different, with different measurements. Just out of curiosity, try mounting it on different spots... maybe the slot you chose is out of spec.

I'll do that tonight and see if it fits. Thanks!

 

[Nitrous SSC]

Tell that to Glock, H&K, Sig, S&W, and any other manufacturer with a polymer hand gun.

Magpul sights are very effective, when used per the manufacturer's instructions. Not a very exhaustive test, but the MBUS did fair better. Back Up Iron Sight Drop Test | Kit Up!

ETA: Not a MBUS fan, but for reasons other than durability.

Last time I checked the factory sights on my M&Ps and other polymer hand guns are steel mounted on a steel slide.

 

[js_paddle07]

Last time I checked the factory sights on my M&Ps and other polymer hand guns are steel mounted on a steel slide.

Glock factory sights are in fact plastic, and have been performing quite well for a couple decades.

 

[cyphertext]

Last time I checked the factory sights on my M&Ps and other polymer hand guns are steel mounted on a steel slide.

Glock factory sights, at least gen3 and earlier were plastic. The S&W SDVE handguns have a plastic rear sight. Many firearms have plastic sights without issue.

 

[Lost Lake]

You guys crack me up with plastic sights and Mickey Mouse rails, waiting for the Big One to happen and thinking you will depend on your cheap plastic toys to get you through.

Buy something decent and depend on it. Feel good knowing you have something decent and not made by Fisher Price.


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[cyphertext]

You guys crack me up with plastic sights and Mickey Mouse rails, waiting for the Big One to happen and thinking you will depend on your cheap plastic toys to get you through.

Buy something decent and depend on it. Feel good knowing you have something decent and not made by Fisher Price.


.

Says the man who buys M&P Shields! Polymer is just a fact of life with firearms now. One could buy different sights than Magpuls, like I have, but for others they work just fine. They are meant to be backup sights, not primary sights.

 

[rojodiablo]

I use a red dot as my primary sight. You are correct in your assessment though -- when my red dot goes out at the range or gets hit from enemy gunfire, it will be imperative that my back up sights are metal so I can return accurate fire and make it to the truck alive.

Actually, ANY optic which takes a direct rifle hit will come apart; regardless of the material it is made of. If the optic holds together fairly well??? It's usually doing so a couple feet away from the rifle.
The poly sights are really durable. We might not like that, being fans of metal.... but it is the truth. (I am NOT giving up my 9504 for a Glock; I gotta draw the line somewhere!!)

I run the ARMS sights; I have Magpul on 1 rifle, and Knights' on another. The ARMS sights have taken a couple drops; I dunno; maybe 10 feet was the worst. I was impressed, the rifle bounced a bunch, and the sight was a bit mangled looking. Works fine- 2 years later. The plastics have the ability to flex more and return to shape vs. bending. The sheer strength of the steel sights is not at issue; the problem is bending if a hard landing is the meal served up.
We cooked an ARMS sight on a 308's gas block. It was there for several seasons. A lot of rounds and heat. The bottom half cracked and crumbled. I can't complain; the barrel would get well past too hot to touch without serious gloves; plastic foregrips would be getting stinky and smoking; the sight must have been much hotter given it's direct contact. If the optic had not been on a very high use rifle, I am certain it would have held up for a half of forever.