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The Range
Rifle & Shotgun Discussion
AR15 build questions
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<blockquote data-quote="ez bake" data-source="post: 1469225" data-attributes="member: 229"><p>The canted and high mounts are at the same height - they will both do lower 1/3 co-witness. This means that the irons will appear in the lower 1/3 of the optic - since its a red-dot optic, this won't matter because no matter where you move your head behind the optic, as long as you can see the dot, it will be on-target (once sighted in).</p><p></p><p>What it does is allow you to look over the irons and use the optic only (when the irons are up).</p><p></p><p>Its really not necessary when using flip-ups since you can just put the BUIS down - but its a matter of preference.</p><p></p><p>In all honesty, on my guns with flip-ups, I prefer the low mounts (or Absolute Co-witness which puts the irons right in the middle of the optic) because they allow me to get a better cheek-wield (because my face doesn't have to be as high up to look through the optic) and if I don't want to use the irons, I flip them down.</p><p></p><p>On my Sabre Defence (which has fixed Irons), I prefer to use the high-mount that allows me to look over the irons should I want to (since I can't flip them down). The high (or lower 1/3 co-witness) mounts are more popular among the ARFcom and M4Carbine.net crowds.</p><p></p><p>The cantilever mount only moves the optic forward (from where the high-mount naturally puts the optic) over the rail-space of the quad-rail without mounting anything to the quad rail - this is done to have a solid mounting point (the flat-top rail) and to move the optic forward should you want to add a magnifier behind it and still maintain a nose-to-charging-handle position on the gun (typically with the stock collapsed all the way down).</p><p></p><p>I honestly love Primary Arms' products, but I don't fancy any of the cheaper cantilever mounts made by anyone because they're not as solid as say a LaRue or ADM mount (or even Primary Arms' High non-cant mount).</p><p></p><p>You won't find better flip-up BUIS than Magpul for the money - I wouldn't try because I doubt you'll find any that are even worth the money for less than Magpul's. If you're serious about using Irons, I would look at getting Daniel Defense or LMT fixed BUIS or upgrade the Irons to something a little better.</p><p></p><p>My biggest complaints with the Magpuls are that they won't use a standard tool to adjust them (the front adjustment notches are not wide enough for the same tool that works on standard AR-15 A2/A3 sights) and the blades on either side of the front sight post are not nearly high enough. </p><p></p><p>They are solid and well built, but don't really do well with super-high heat (if you're planning on bump-firing or putting a lot of rounds through the weapon at a single time (like 5 or more 30rd mags at once), you'll notice that they put off smoke as you get the barrel/handguards heated up).</p><p></p><p>What upper did you end up getting and what quad-rail did you get? This is a Carbine right? With a carbine-length rail or a longer rail?</p><p></p><p>Did you get a different front sight block than standard A2?</p></blockquote><p></p>
[QUOTE="ez bake, post: 1469225, member: 229"] The canted and high mounts are at the same height - they will both do lower 1/3 co-witness. This means that the irons will appear in the lower 1/3 of the optic - since its a red-dot optic, this won't matter because no matter where you move your head behind the optic, as long as you can see the dot, it will be on-target (once sighted in). What it does is allow you to look over the irons and use the optic only (when the irons are up). Its really not necessary when using flip-ups since you can just put the BUIS down - but its a matter of preference. In all honesty, on my guns with flip-ups, I prefer the low mounts (or Absolute Co-witness which puts the irons right in the middle of the optic) because they allow me to get a better cheek-wield (because my face doesn't have to be as high up to look through the optic) and if I don't want to use the irons, I flip them down. On my Sabre Defence (which has fixed Irons), I prefer to use the high-mount that allows me to look over the irons should I want to (since I can't flip them down). The high (or lower 1/3 co-witness) mounts are more popular among the ARFcom and M4Carbine.net crowds. The cantilever mount only moves the optic forward (from where the high-mount naturally puts the optic) over the rail-space of the quad-rail without mounting anything to the quad rail - this is done to have a solid mounting point (the flat-top rail) and to move the optic forward should you want to add a magnifier behind it and still maintain a nose-to-charging-handle position on the gun (typically with the stock collapsed all the way down). I honestly love Primary Arms' products, but I don't fancy any of the cheaper cantilever mounts made by anyone because they're not as solid as say a LaRue or ADM mount (or even Primary Arms' High non-cant mount). You won't find better flip-up BUIS than Magpul for the money - I wouldn't try because I doubt you'll find any that are even worth the money for less than Magpul's. If you're serious about using Irons, I would look at getting Daniel Defense or LMT fixed BUIS or upgrade the Irons to something a little better. My biggest complaints with the Magpuls are that they won't use a standard tool to adjust them (the front adjustment notches are not wide enough for the same tool that works on standard AR-15 A2/A3 sights) and the blades on either side of the front sight post are not nearly high enough. They are solid and well built, but don't really do well with super-high heat (if you're planning on bump-firing or putting a lot of rounds through the weapon at a single time (like 5 or more 30rd mags at once), you'll notice that they put off smoke as you get the barrel/handguards heated up). What upper did you end up getting and what quad-rail did you get? This is a Carbine right? With a carbine-length rail or a longer rail? Did you get a different front sight block than standard A2? [/QUOTE]
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