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The Range
Rifle & Shotgun Discussion
AR15 build questions
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<blockquote data-quote="ez bake" data-source="post: 1470000" data-attributes="member: 229"><p>I've already pointed out what you need. You ordered an upper with a railed gas-block. You can either mount a sight to it (which would need to be a gas-block-height sight - it can be either flip-up or fixed). </p><p></p><p>They're called "gas-block height" front sights because the railed gas-block sits lower than the quad-rail does. That is the only thing special about that sight that you will need to remember. </p><p></p><p>Technically, you could just mount a regular rail-height front sight to the front of your quad-rail (behind the gas-block), but then you'd have a pretty short sight-radius - I wouldn't personally do that.</p><p></p><p>If you don't want to go that route, then change the gas-block to one that has a front sight built-in (they make flip-ups and fixed).</p><p></p><p>If you don't want to go that route, then get a low-profile gas block - one that is tiny enough to allow a quad-rail to extend passed it (most popular is a mid-length) and then mount a standard rail-height front sight to the front of the quad-rail. It will extend far forward enough that you'll have a good sight-radius. This is my favorite route and would work with Magpul MBUS sights (front and rear).</p><p></p><p>Either way, you'll need a rear iron sight if you want to run irons - I've never heard of a low-profile rear iron sight, and I don't understand what you mean by that, but a standard height rear iron should be fine (either a flip-up or fixed).</p><p></p><p>If you want to run a red-dot optic that co-witnesses with your irons, you have either choice:</p><p></p><p>1. Absolute co-witness (shorter mount) which puts the irons in the middle of the red-dot and makes it difficult to look over the irons and through the red-dot - if you have flip-ups, I'd go this route, but if you have either a fixed rear or fixed front Iron, I would avoid this route.</p><p></p><p>2. Lower 1/3 co-witness (high mount) which puts the irons towards the bottom of the optic and allows you to use the red-dot by looking over the irons as well as through them. I would go this route if I had fixed-irons (not flip-ups)</p><p></p><p>Both of these choices are purely preference.</p></blockquote><p></p>
[QUOTE="ez bake, post: 1470000, member: 229"] I've already pointed out what you need. You ordered an upper with a railed gas-block. You can either mount a sight to it (which would need to be a gas-block-height sight - it can be either flip-up or fixed). They're called "gas-block height" front sights because the railed gas-block sits lower than the quad-rail does. That is the only thing special about that sight that you will need to remember. Technically, you could just mount a regular rail-height front sight to the front of your quad-rail (behind the gas-block), but then you'd have a pretty short sight-radius - I wouldn't personally do that. If you don't want to go that route, then change the gas-block to one that has a front sight built-in (they make flip-ups and fixed). If you don't want to go that route, then get a low-profile gas block - one that is tiny enough to allow a quad-rail to extend passed it (most popular is a mid-length) and then mount a standard rail-height front sight to the front of the quad-rail. It will extend far forward enough that you'll have a good sight-radius. This is my favorite route and would work with Magpul MBUS sights (front and rear). Either way, you'll need a rear iron sight if you want to run irons - I've never heard of a low-profile rear iron sight, and I don't understand what you mean by that, but a standard height rear iron should be fine (either a flip-up or fixed). If you want to run a red-dot optic that co-witnesses with your irons, you have either choice: 1. Absolute co-witness (shorter mount) which puts the irons in the middle of the red-dot and makes it difficult to look over the irons and through the red-dot - if you have flip-ups, I'd go this route, but if you have either a fixed rear or fixed front Iron, I would avoid this route. 2. Lower 1/3 co-witness (high mount) which puts the irons towards the bottom of the optic and allows you to use the red-dot by looking over the irons as well as through them. I would go this route if I had fixed-irons (not flip-ups) Both of these choices are purely preference. [/QUOTE]
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