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Posted: 6/28/2005 6:42:15 PM EDT
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Is there a significant sight radius difference between the M4 type carbines and the CAR type carbines? I'm new to AR's, so bear with me, but does bringing the gas port back make any difference to function? I'm looking to buy one or the other and I'd like to make the best choice. TIA |
| I'm just going by the pictures I'm looking at and it appears that with the shorter handguards that the front sight is also a shorter distance from the rear sight. Am I seeing things? hinking.gif |
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The longer gas systems are softer operating. The rifle gas system operates at the lowest pressure and, in theory, causes less wear on operating parts. The mid-length gas system is a little more violent than the rifle gas system, but it is still less violent and less abusive than the shorter carbine gas system. The carbine gas system is about the shortest you will come upon (short of the 7.5" DPMS Kitty Kat upper) and is supposed to run at twice the gas pressure as the rifle system. Thi is supposed to cause more wear and it also has the possibility of having extraction problems because of the quick and violent rearward movement of the bolt/carrier assembly. The bolt/carrier supposedly jerks rearward so fast that, at times, can get a bad hold on the spent shell, and leave it in the chamber. Please feel free to correct me if I'm wrong, of course. WIZZO |
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The Dissipator is sort of a cross between a carbine and a rifle. You have rifle length guards and a rifle length sight radius and gas system, but with a carbine barrel and carbine weight. Pros: Light weight, easy manueverability, full sight radius Cons: I'm trying to think of one.... |
Weight of an extra gas block; more front-heavy because the FSB is pushed further out; add'l weight of a longer rail system, if any; and still uses the carbine gas system (minor, I know). Midlengths address most of these. Weight-wise they're between a carbine and dissy (all else equal), but probably closer to the weight of a carbine. I guess it depends what is more important to you: longer sight radius, or less weight and smoother cycling. ETA: You could always build a midlength dissy, and keep your longer sight radius. I think someone has done this already. |
Real Dissipators (Bushy trademarked product) use a Carbine length gas system. AFAIK the only 'rifle length' gas sytems dissy-style carbines are custom builds.
A standard Bushy Dissipator is not 'Light Weight' Dissy's made from cut down A2 or A1 barrels are fairly light
1) Non standard handguards (if it's a Bushy style carbine - they have to have their heat sheilds modified). 2) Heavy if Bushy style with an HBAR barrel. 3) Cut 20" barrel Dissy's are more likely to give you problems if you don't build them right as your dwell time is very small. |
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