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Posted: 11/24/2011 6:07:38 AM EDT
| Lately I've been pricing and looking real hard at a Middy rifle kit from PSA, but have seen some Dissys that have caught my eye. Can anyone tell me the pro's and con's of getting a Dissy over a Middy or should I just stick with a Middy? |
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The main benefit of a Dissy is a longer sighting plane when using iron sights, allowing for greater precision. The longer handguard can also also useful depending on your shooting position.
As I understand it, the PSA Dissy employs a mid-length gas system....it just has the traditional front sight post set up ahead of the gas block. I think the PSA Dissipator is also a sharp looking combination for a 16" barrel length....but that is strictly subjective. |
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Quoted:
The main benefit of a Dissy is a longer sighting plane when using iron sights, allowing for greater precision. The longer handguard can also also useful depending on your shooting position. As I understand it, the PSA Dissy employs a mid-length gas system....it just has the traditional front sight post set up ahead of the gas block. I think the PSA Dissipator is also a sharp looking combination for a 16" barrel length....but that is strictly subjective. Right on. The longer sight radius is the advantage. |
| I was more interested in the operational aspect rather than the looks of the upper. Is the dissy more efficient in the use of gas than the middy or does that even matter? I just want the most efficient. I've read where the recoil impulse is not as great in a middy as opposed to a carbine length gas system and was just curious if the dissy is better than a middy. |
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Quoted:
I was more interested in the operational aspect rather than the looks of the upper. Is the dissy more efficient in the use of gas than the middy or does that even matter? I just want the most efficient. I've read where the recoil impulse is not as great in a middy as opposed to a carbine length gas system and was just curious if the dissy is better than a middy. A Dissy does not have to have a rifle length gas system, it could use a mid-length or carbine, all then having the front sight post at the rifle length location. If not gassed properly, the rifle length gas system can be problematic with respect to cycling the BCG, (most folks have this worked out now). The advantage of a rifle length gas sytem is the softer cycle impulse and somewhat less carbon fouling relative to the shorter gas sytems. A carbine gas sytem is somewhat worse in terms of impulse and fouling, mid-length gas sytems are softer than carbine and slightly less fouling, and as stated above, the rilfe is even softer in impulse and slightly less in fouling than the middy. As such, a mid-length gas sytem with a Dissy FSB might be the best compromise option, with a decent impulse, moderate fouling, and very reliable cycling. |
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Quoted:
I was more interested in the operational aspect rather than the looks of the upper. Is the dissy more efficient in the use of gas than the middy or does that even matter? I just want the most efficient. I've read where the recoil impulse is not as great in a middy as opposed to a carbine length gas system and was just curious if the dissy is better than a middy. The most efficient Dissy uppers use a Carbine or mid length gas. The rifle gas will work, but many have had issues with weaker ammo. If you run drills with your rifle then you want to shoot as much as you can and in most cases that means cheaper ammo. I went with a Mid-gas Dissy and i converted my carbine M4gery to a Dissy as well. Both run great, but I prefer the mid length as it runs a bit smoother. The Dissy is the rifle mans carbine, The longer sight radius means better hits at farther targets. It's my favorite configuration as it embodies all the benefits of a crabine barrel (short, light, easy to manipulate) with the sights of a rifle. |
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Quoted:
Why create the best of both worlds. I created a middy upper with rifle length FF handguards. I did both actually. thing is if you are wanting a simple rifle with cost in mind the Dissy is the best bang for buck. once you free float it you then will need a set of flip up sights or fixed (what would be the point of that??). The common belief is that a battle rifle needs a fixed front sight that is pinned and therefore very tough. I like the fixed front sight on a Dissy for ease of use and options: I can throw a carry handle on it and it's good to go. Get a used one on the EE for around $40 (sometimes cheaper) shipped. LMT style cut carry handle type still looks natural. Flip up rear sight works as well, especially when a optic is thrown on. The STAG rifle I have is a Carbine that has been converted to be a Dissy by using a chopped FSB as a low profile gas block. I then used a Armalite clamp on front FSB but kept the original FSB and hand guard cap. I can convert between the two configurations when I want to. I can go back to an M4 style upper in about 15minutes in the garage. The Clamp on FSB is pretty stout, but not as tough as a pinned one. Dissy pics 
Converted Dissy: 
Free Float 15" rail on a 16" barrel. 
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