Posted: 5/6/2009 7:34:53 AM EDT
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This was started in another forum, but I figured this might be a better place to continue the discussion...
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I asked the same question. The front can only be handguard mounted. I guess the gas block gets to hot from what I was told. Hmmm.....Did this information come from Magpul? I didn't consider heat as a potential reason. I was assuming that "rail mount-only" was meant to imply that they were not tall enough for gas block rails that were lower than the top rail. I figured you would be GTG as long as your gas block rail was the same height as the upper receiver. I'm no expert, but it seems unlikely that this would be a real problem. I mean, it's not like the magazine well isn't exposed to relatively high temps; if these levels of heat were an issue, it seems like pmags would be prone to warping problems. (Which doesn't seem to be the case.) I would like an answer on this as well. I have 2 builds I am finishing where the MBUS will be my primary sight until I cann afford decent glass for them. I plan on mounting them on a steel same plane gas block. Please MAGPUL, don't tell me this will be a problem.... We do not recommend the front MBUS being used on a gas block due to the temps involved. YMMV but we deal with machine guns and the gas block temps get really high, so we just don't recommend it. What would the danger of running them on a gas block be? Is there a possibility of them melting? Would they get brittle after cooling down? I only have semi-auto, but I do like to shoot a decent amount when I get the chance. I have all my parts for my builds in hand or in transit and this throws a wrench in my plans. I was all set up to mount these on the gas block. How real is the danger of damaging the sight on a steel front gas block? Has it been tested this way? Thanks for any input. |
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Are the MBUS the same material as the Magpul MOE™ Hand Guard ? After all, it attaches to the FSB. Not trying to be difficult here guys, just dont want to have to buy new forends and gas blocks or risk melting my front MBUS. Need details and thoughts......
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Are the MBUS the same material as the Magpul MOE™ Hand Guard ? After all, it attaches to the FSB. Not trying to be difficult here guys, just dont want to have to buy new forends and gas blocks or risk melting my front MBUS. Need details and thoughts...... Thanks! STOP THAT LOGIC CRAP!!!!! |
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Are the MBUS the same material as the Magpul MOE™ Hand Guard ? After all, it attaches to the FSB. Not trying to be difficult here guys, just don't want to have to buy new forends and gas blocks or risk melting my front MBUS. Need details and thoughts...... Thanks! STOP THAT LOGIC CRAP!!!!! Sorry, I retract my logic and submit utter stupidity: 
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| For one thing, it is too short to mount to a gas block, secondly the MFG has recommended against it. The handguard contacts the ring behind the FSB, it is not directly attached over the gas port like a sight on a railed gas block would be. What more do they need to say other than "don't?" |
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For one thing, it is too short to mount to a gas block, secondly the MFG has recommended against it. The handguard contacts the ring behind the FSB, it is not directly attached over the gas port like a sight on a railed gas block would be. What more do they need to say other than "don't?" It may be too short to mount to YOUR gas block, but mine are longer. Some of us are gifted, some aren't. Genetics, you know.
I KNOW they say they recommend against it. UNFORTUNATELY, they said this after I bought them for my builds. So I have 3 sets sitting here on my desk waiting for my barrels to be delivered Monday to be assembled with my same - plane gas blocks. Since I have not heard this anywhere until AFTER my order, I am hoping to gain some additional information as to why it may not work and what the dangers may be so I can decide if I need to order new parts or try it with the ones I have. But thanks for contributing nothing to the thread other than speculation. ETA: Spelling |
| Most plastics are of the thermosetting type and can withstand some pretty amazing temperatures but, I can only speculate as to Magpuls polymer mixture and from what I can see and feel of the materials, exposing the Mbus to the extreme temperatures that a gas block can generate, It wouldn't be in your best interest to mount a plastic sight to a component that can reach and exceed 400 degrees and melt down a perfectly servicable sight. It would be similar to melting your shoe sole to a hot exhaust on a motorcycle. |
| You people do realize Magpul test the hell out of every product they release in every type of extreme environment and mounting solution/sling setup they can think of. What do you think take's so long for the products to come out they don't just sit around the office and twirl pencils in there beards. If a manufacturer says don't do something don't do it especially a company like Magpul. |
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For one thing, it is too short to mount to a gas block, secondly the MFG has recommended against it. The handguard contacts the ring behind the FSB, it is not directly attached over the gas port like a sight on a railed gas block would be. What more do they need to say other than "don't?" It may be too short to mount to YOUR gas block, but mine are longer. Some of us are gifted, some aren't. Genetics, you know.
I KNOW they say they recommend against it. UNFORTUNATELY, they said this after I bought them for my builds. So I have 3 sets sitting here on my desk waiting for my barrels to be delivered Monday to be assembled with my same - plane gas blocks. Since I have not heard this anywhere until AFTER my order, I am hoping to gain some additional information as to why it may not work and what the dangers may be so I can decide if I need to order new parts or try it with the ones I have. But thanks for contributing nothing to the thread other than speculation. ETA: Spelling Really? I found out about this two weeks after I 'pre-ordered' with Magpul, and called Justin up to cancel my front sight a full month before they shipped. My gas block is currently home to a Samson FFS. Also, I am sure you could head over to the EE and find a happy home for your MBUS fronts if you want. That being said, they are [b]your[/i] rifles, do what you want. If you don't shoot enough to get the gas block that hot, I would not sweat it. All Magpul is saying is that it is not a good idea and don't come back bitching to us about it or we will say "I told you so." |
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You people do realize Magpul test the hell out of every product they release in every type of extreme environment and mounting solution/sling setup they can think of. What do you think take's so long for the products to come out they don't just sit around the office and twirl pencils in there beards. If a manufacturer says don't do something don't do it especially a company like Magpul. If they say "don't do it" I ask why. IE: "Mounting a MBUS on a gas block may damage it, if the block gets too hot." or "Most railed gas blocks are too low to allow the use of a MBUS sights." My Solution: I buy a gas block with a rail level with the receiver rail and add vents to the gas block to keep the temp that the MBUS is exposed too down. |
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For one thing, it is too short to mount to a gas block, secondly the MFG has recommended against it. The handguard contacts the ring behind the FSB, it is not directly attached over the gas port like a sight on a railed gas block would be. What more do they need to say other than "don't?" It may be too short to mount to YOUR gas block, but mine are longer. Some of us are gifted, some aren't. Genetics, you know.
I KNOW they say they recommend against it. UNFORTUNATELY, they said this after I bought them for my builds. So I have 3 sets sitting here on my desk waiting for my barrels to be delivered Monday to be assembled with my same - plane gas blocks. Since I have not heard this anywhere until AFTER my order, I am hoping to gain some additional information as to why it may not work and what the dangers may be so I can decide if I need to order new parts or try it with the ones I have. But thanks for contributing nothing to the thread other than speculation. ETA: Spelling Technically my gas block is also a FSB, so I don't know if you really want to break out the ruler and measure. If you don't mind if the MBUS melts if you get it too hot, and you lose 0, then go for it. It isn't like it would make your rifle explode. Unfortunately all anyone can do is speculate, I haven't seen anyone post that they have done it- and Magpul recommends against it. I personally wouldn't mess with it if you life depends on the rifle, but if it is just BUS for a recreational gun, give it a shot and let us know how it works for you. |
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Okay, the madness stops here. A little clarification.
Testing has shown that the MBUS does not stand up to the temps of a gas block. It would be safe to say that after sixty rounds there would be deformation of the sight. Therefore the warning in the instruction manual says not to use the MBUS on railed gas blocks. The hand guard only has a small contact area and it is not in direct contact with the gas block and is not effected by heat in typical operational environment. The MBUS would sit on the hottest part of the rifle covering a large surface area and will be effected. I'll have to search for the thread where this was discussed prior to releasing these. I know it's been discussed before. We apologize to anyone with railed gas blocks who bought these prior to knowing about compatability. They'll sell quick on the E. As far as altering a gas block and adding vents. Not my cup of tea. I beleive the heat would still have the potential to damage them. What do I know though? Hope this helps a litlte. |
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Okay, the madness stops here. A little clarification. Testing has shown that the MBUS does not stand up to the temps of a gas block. It would be safe to say that after sixty rounds there would be deformation of the sight. Therefore the warning in the instruction manual says not to use the MBUS on railed gas blocks. The hand guard only has a small contact area and it is not in direct contact with the gas block and is not effected by heat in typical operational environment. The MBUS would sit on the hottest part of the rifle covering a large surface area and will be effected. I'll have to search for the thread where this was discussed prior to releasing these. I know it's been discussed before. We apologize to anyone with railed gas blocks who bought these prior to knowing about compatability. They'll sell quick on the E. As far as altering a gas block and adding vents. Not my cup of tea. I beleive the heat would still have the potential to damage them. What do I know though? Hope this helps a litlte. Here, allow me: Magpul, I need MBUS Now shipping!!!! My pics in OP (Page 14 of 35) Thanks for your imput, Drake. Always appreciated when you guys come on here. |
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Does it make any difference if it is a Piston AR?? http://i603.photobucket.com/albums/tt117/bobapunk/CMMG-M4-LEP-b.jpg Would you grab your gasblock after dumping a mag of ammo? |
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Does it make any difference if it is a Piston AR?? http://i603.photobucket.com/albums/tt117/bobapunk/CMMG-M4-LEP-b.jpg No, we tested pistons too. |