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The Range
Rifle & Shotgun Discussion
Thinking about a 9mm AR upper...
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<blockquote data-quote="338Shooter" data-source="post: 1440238" data-attributes="member: 3449"><p>There are two types of top loading block. One that drops in for quick swaps but doesn't allow you to use a standard AR15 bolt catch and bolt hold open. You can use the 9mm bolt catch that is very prone to breaking, but this renders it only good for 9mm defeating the purpose of having the fast swap top loading model. If you don't care about bolt hold open, and want fast caliber swaps, this is the way to go I guess. </p><p></p><p>The other goes under the bolt catch and allows the use of a standard bolt catch and bolt hold open feature. But, it requires the removal of the bolt catch roll pin to remove for caliber swaps. If you want a dedicated 9mm and have no plans on changing calibers I'd run this one (I'd probably really run the bottom loading block for this one too).</p><p></p><p>The bottom block is the only one that is a quick swap and still gives you bolt hold open with a standard bolt catch. If you want quick and easy caliber swaps and bolt hold open this is the way to go.</p><p></p><p>9mm bolt catch:</p><p>The long tab that the mag engages breaks off easily.</p><p><strong>[Broken External Image]</strong></p></blockquote><p></p>
[QUOTE="338Shooter, post: 1440238, member: 3449"] There are two types of top loading block. One that drops in for quick swaps but doesn't allow you to use a standard AR15 bolt catch and bolt hold open. You can use the 9mm bolt catch that is very prone to breaking, but this renders it only good for 9mm defeating the purpose of having the fast swap top loading model. If you don't care about bolt hold open, and want fast caliber swaps, this is the way to go I guess. The other goes under the bolt catch and allows the use of a standard bolt catch and bolt hold open feature. But, it requires the removal of the bolt catch roll pin to remove for caliber swaps. If you want a dedicated 9mm and have no plans on changing calibers I'd run this one (I'd probably really run the bottom loading block for this one too). The bottom block is the only one that is a quick swap and still gives you bolt hold open with a standard bolt catch. If you want quick and easy caliber swaps and bolt hold open this is the way to go. 9mm bolt catch: The long tab that the mag engages breaks off easily. [b][Broken External Image][/b] [/QUOTE]
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