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Posted: 5/22/2005 11:40:21 AM EDT
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Newb question: Other than looks and weight, why aren't 16" carbines made with a lightweight, low-profile gas block at the end of the handguards and the FSB out at the end of an M4 barrel to maximize sight radius? Thanks. |
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One of the important design goals of the M4 was to preserve the spacing between the muzzle and the FSB/bayo lug from the M16, allowing bayonets and other M16 accessories to function on the M4. What you're describing is a "Dissipator" setup, which is incompatible with many military accessories (but otherwise a good setup). -Troy |
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I have pretty limited AR knowledge, but if that statement is true, then why does CMMG sell the following: "Chrome Lined MOD4 16"Barrel New Production Mil-Spec 16" Chrome Lined 5.56 chambered M4 barrel. 4150 steel. 1/7 twist?" I looked at the dissipator setup, and I may be misunderstanding it, but those uppers had longer handguards that increased the weight substantially (it seemed.) So, what I'm trying to see is if you could get the same benefit of increased sight radius (assuming one didn't want to install a bayonet), by just pushing the FSB to the front and maintaining the gas system with a low profile gas block? Thanks again. |
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The handguards aren't what increases the weight; it's the second, shaved FSB that's under the handguards that is responsible for most of the extra weight. Of course, it is possible to make a Dissipator with only one gas block, but it requires opening up the gas port to the proper size (.110"):  This is mine, shown without the handguards installed. It started as a 20" BM 1:7 A2 barrel, and had the front 3.5" or so removed, and gas port opened up. -Troy |
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