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Posted: 10/7/2009 6:34:10 PM EDT
| I just shot my AA piston conversion for the first time and I had no idea that the gas block and top hand guard would get so hot. I fired two magazines in about 2-3 minutes and the gas block was extremley hot and the handguard was not far behind it. I had the plastic HG's that came with the system on because I am in the process of modifiying my quad rail. I often fire several hundred rounds in a short time frame so I am little concerned that the system would cause the HG to become too hot to handle. If anyone else that has concerns or knowledge that will eleviate my concerns I would appreciate it. I am suprised that no one mentions this, all I have read is that the system runs so cool which the bolt and BCG do but it is traded to the front where the shooters hands are. |
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Quoted:
Yes the block gets hot, but so does a DI gun in the same spot. If you like hot try a SCAR sometime, the worlds hottest gun, they mounted the aluminum bottom rail to the barrel so the heat goes right thru it making it Awsomely Hot! Did they really? That's just retarded |
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warning: troy sights have a plastic bushing inside. it WILL melt and you will no longer have a flip up front sight. (trust me...it HAPPENED~) Dammit. That's the first I've heard about Troy sights having plastic in them. I have two Troy-built BCM sights on the way to sit on top of AA piston blocks. |
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Quoted: I just shot my AA piston conversion for the first time and I had no idea that the gas block and top hand guard would get so hot. I fired two magazines in about 2-3 minutes and the gas block was extremley hot and the handguard was not far behind it. I had the plastic HG's that came with the system on because I am in the process of modifiying my quad rail. I often fire several hundred rounds in a short time frame so I am little concerned that the system would cause the HG to become too hot to handle. If anyone else that has concerns or knowledge that will eleviate my concerns I would appreciate it. I am suprised that no one mentions this, all I have read is that the system runs so cool which the bolt and BCG do but it is traded to the front where the shooters hands are. My system runs real hot as well.....but no failures at all |
Crap! I just ordered the AA Conversion...and a front Troy Flip Sight! 
I'll be installing a DD lite 7" rail w/ the AA Conversion. Instead of mounting the Troy on the gas black, is it cool enough to mount it on the end of the DD Lite rail or will that still be too hot? |
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the dd lite rail is not a great choice.
even though there is barely enough clearance, you will get some handguard rub with the oprod. if you are going to blast and don't care, it is fine. if you do want to minimize the contact, go with a dd omega piston rail. it works great. |
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I e-mailed AA about the Troy Front Sight. Here's what I got:
Our gas block gets no hotter than any other gas block. Some customers tried the new Magpul polymer MBUS sights on our gas block and they melted. I spoke with Magpul and they do not recommend using their sight on any gas block and to mount it directly to a rail. This is not the case with the Troy sights. They are used by Ruger as gas block mounted flip up sights and they work just fine. Also many of our customers use Troy sights and we have not heard of any issues from them. The only ones you need to worry about are the Magpul MBUS as they are all polymer and not made to be put on a gas block. Because our gas block sits at rail height you will need the rail height sights and if you do still feel uneasy you can mount it to your rail, but it is not necessary. If you'd like other sights to use, try Samson or PRI, they seem to be very popular as well. If you have any other questions feel free to call or email and we'll help anyway we can. Thank you, John Humphrey Sales and Marketing |
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Quoted:
the dd lite rail is not a great choice. even though there is barely enough clearance, you will get some handguard rub with the oprod. if you are going to blast and don't care, it is fine. if you do want to minimize the contact, go with a dd omega piston rail. it works great. That's dissapointing because AA says on their site that the DD Lite Rails (Not DD M4 Lite) are compatable. 
From their website Q. What handguards/rails can I use with this system? A. This is the list of handguards we currently know will work with our system without any modifications, this list will be updated as more handguards are discovered to work with our system: 1.Our Samson Manufacturing free-floating or drop-in rails listed on our website 2.Daniel Defense Omega Rails 3.Daniel Defense Lite Rails 4.Daniel Defense 9.5 FSP Lite 5.Arms #50 Bi-Level S.I.R. System 6.Troy Industries MRF-DI 7.The modified M4 style handguards provided with our standard system |
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I have a DD light rail 12.0 FSPM with an AA kit and there is no contact between the rail and the op rod. Plenty of clearance. Maybe there is an older version that had this issue, but I don't have it with mine. One of the reasons I like the FSPM is that it shrouds the hot gas block so it is less likely I'll burn myself.
Quoted:
the dd lite rail is not a great choice. even though there is barely enough clearance, you will get some handguard rub with the oprod. if you are going to blast and don't care, it is fine. if you do want to minimize the contact, go with a dd omega piston rail. it works great. |
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Quoted:
I have a DD light rail 12.0 FSPM with an AA kit and there is no contact between the rail and the op rod. Plenty of clearance. Maybe there is an older version that had this issue, but I don't have it with mine. One of the reasons I like the FSPM is that it shrouds the hot gas block so it is less likely I'll burn myself. Quoted:
the dd lite rail is not a great choice. even though there is barely enough clearance, you will get some handguard rub with the oprod. if you are going to blast and don't care, it is fine. if you do want to minimize the contact, go with a dd omega piston rail. it works great. Mine works fine to.http://i914.photobucket.com/albums/ac343/outlaw380/005.jpg |
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take a pair of calipers and measure the clearance from the side of the op rod and the inner walls of the rail. it is a tight fit. i did some accuracy testing with my 9.5 fsp and i was getting poor accuracy at 100 yards. i switched to the dd omega piston rail, and the accuracy issue went away. all barrels will vibrate and flex as they fire. with the tight fit between the oprod and rails (mine at least), there was contact that i wanted to eliminate.
before you guys say anything, shoot some groups and see if it is an issue for you. YMMW. |
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