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Posted: 11/24/2008 7:09:13 AM EDT
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Simple question:
Is a gas block w/ flip-up BUIS less reliable than a Front Post, A2 style? Thanks. |
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"Less reliable" as far as?
I have both standard gas block sights, as well as YHM and PRI flip up gas blocks- I prefer the Flipups, just because I find myself hitting the standard on the environment a lot when i'm doing competitions/classes/hunting... But i guess it all depends on whether you use an optic or not- I don't like to cowitness my red-dots w/ irons, but I like to have Irons, "just in case" so the flip-up is a major bonus for me. So is it an issue of reliability as far as Gas-operation, or accuracy?... or durability?.... I haven't noticed a difference in any of the three––- and I run most of my carbines hard, both in Class and competitions... |
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The question is in regard to a Stag 2HT upper. You can buy Stag uppers with either a gas black in front, or a post. I am wondering about reliability in terms of function (not causing a FTF).
I like the look of the A2 post, but I'm interested in adding an optic down the road one day, so I'm thinking I might regret not having a gas block w/ flip-up front sight. |
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Quoted:
Simple question: Is a gas block w/ flip-up BUIS less reliable than a Front Post, A2 style? Thanks. Nope...a gas block is a gas block. It's either installed wrong or malfunctioning if it's not working properly. My Sabre has the gas block with the YHM flip-up BUIS front and back and I wish all my AR's had them. |
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Quoted:
Quoted:
Simple question: Is a gas block w/ flip-up BUIS less reliable than a Front Post, A2 style? Thanks. Nope...a gas block is a gas block. It's either installed wrong or malfunctioning if it's not working properly. My Sabre has the gas block with the YHM flip-up BUIS front and back and I wish all my AR's had them. +1 |
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A set screw gas block can theoretically move forwards under recoil and cause misalignment with the barrel's gas port - the result is a malfunctioning rifle. Some say this can be more of an issue with aluminum gas blocks due to the different thermal expansion versus the steel barrel. Obviously, pinned gas blocks cannot move (unless the pins fall out).
I can say from first hand experience that this failure is possible ! I had a set screw gas block on a J&T Dissipator work loose due to inadequate stake on the set screw, and I did not notice until the gun started malfing, because it was under the handguard. If you want a specific, specialty gas block, such as one with an integral Pic rail, folding sight, or adjustable gas, then just make sure the barrel is dimpled for the set screws, and that the set screws is LocTited AND staked really well. Oh, and I would personally only use a steel gas block, for the reason above and to avoid stripping of the set screw thread. If you want utmost robustness and reliability, stick with a pinned (GI) FSB, and cut off the top to have an unobstructed view through an optic. JMHO. YMMV. |
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Quoted:
Quoted:
If the gas block is held on with set screws, then it's a no-go for me. If it's pinned, then I don't see a problem. funny, I feel the exact opposite. any particular reason? Luckily StealthyBlagga saved me some typing. 
My simple answere is that I just trust pins more than screws. 
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Quoted:
Quoted:
If the gas block is held on with set screws, then it's a no-go for me. If it's pinned, then I don't see a problem. funny, I feel the exact opposite. any particular reason? I've seen set screws fall out, and set screw devices move after alot of shooting. I've NEVER seen or heard of a pinned FSB (or gas block) comming loose or taper pins falling out. |
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