ic_guerrero
10-21-07, 22:05
I purchased a KAC NT-4 QDSS suppressor back in January of this year and I finally received it sometime in September. The first time I went to the range I fired about 300 rounds of 5.56 mm 75gr TAP. On the second outing I fired about 200 rounds of BH 55gr red box. Here go some of the things that I noticed when firing. I know that most people probably already know this, but in case you didn't here goes:
1. The gas blow back that comes out of the ejection port sinks like shit. Thank God for the PRI Gas-buster.
2. Lube does last as long when firing suppressed.
3. The can gets HOT and the rifle will get hotter than normal.
4. 5.56 suppressed is still loud.
Know to the equipment:
LMT 10.5" upper
LMT FA BCG
KAC FH
KAC NT-4 QDSS
LMT BUIS
KAC RAS w/ SAS lower
Aimpoint M3 on Larue mount
SF M951C
LMT lower
LMT 2-stage trigger
LMT SOPMOD
H Buffer
Larry Vickers 2pt sling
Slip 2000 lube
http://i17.photobucket.com/albums/b51/ic_guerrero/IMG_4624.jpg
Ammo:
Hornady TAP 75gr 5.56mm
BH 55gr red box
http://i17.photobucket.com/albums/b51/ic_guerrero/IMG_4675.jpg
KAC NT-4 QDSS
http://i17.photobucket.com/albums/b51/ic_guerrero/IMG_4680.jpg
What came in the box: Can, shim kit, KAC FH, small bottle of Rocksett and owners guide.
http://i17.photobucket.com/albums/b51/ic_guerrero/IMG_4681.jpg
http://i17.photobucket.com/albums/b51/ic_guerrero/IMG_4682.jpg
Pic of baffles
On my first outing I fired 300 rounds of 5.56 TAP at 50 yards and 100 yards. The accuracy of the rifle didn't change with the suppressor on at 50 yards but it did open up and shot lower at 100 yards. After shooting the 300 rounds and letting the suppressor cool down I was able to remove with out using any tools. One thing I did notice was that the rifle started short stroking right around 200 rounds. I added more lube to the BCG port holes but it didn't get rid of the problem. The other thing that I noticed was that it sent a lot of carbon fouling into the magwell which tarnished the ammo (see pics below). When I got home and started to clean the rifle I realized that running a suppressor on a SBR gets the BCG, bore, and everything else extremely DIRTY!!
On the second trip to the range I fired a string of 200 rounds of Black Hills 55gr Red Box. On the second trip I made sure that the BCG and the buffer tube spring where generously lubed. I didn't try to readjust the zero for the 55gr, so I don't have an accuracy report, but it shot well enough for 50 yards. Removing the suppressor the second time was a bitch. I had to use my Leatherman and Slip Carbon Killer to get it off. Clean up was much easier this time around, but I still had some short stroking issue.
http://i17.photobucket.com/albums/b51/ic_guerrero/IMG_4685.jpghttp://i17.photobucket.com/albums/b51/ic_guerrero/IMG_4686.jpg
Pics of FH after second outing
http://i17.photobucket.com/albums/b51/ic_guerrero/IMG_4684.jpg
The threads that you see in the pic are supposed to help breaking up the carbon fouling when removing the suppressor
http://i17.photobucket.com/albums/b51/ic_guerrero/IMG_4678.jpg
http://i17.photobucket.com/albums/b51/ic_guerrero/IMG_4676.jpg
Pics of carbon fouling on mags
http://i17.photobucket.com/albums/b51/ic_guerrero/IMG_4672.jpg
Top row is BH red box that was left in the last mag and bottom row was all of the ejected rounds from "tap rack bang" when it was short stroking
http://i17.photobucket.com/albums/b51/ic_guerrero/IMG_4677.jpg
Same ammo, primer views
http://i17.photobucket.com/albums/b51/ic_guerrero/IMG_4687.jpg
http://i17.photobucket.com/albums/b51/ic_guerrero/IMG_4689.jpgRifle and rig
PROS:
-Easy to make follow up shots
-Quiet enough to use with out hearing protection
-Reduced recoil (not that it was a problem before)
-QD mount is easy to use with bare hands or when using thin gloves (flight gloves)
-GWOT tested and approved
CONS
-weight (lighter can available from other manufactures)
-QD lever can be hard to move after a long string of fire
-rifle gets very dirty and lube won't last as long
-can gets HOT!!! (this is with all cans)
Overall this is a great can. If I could afford more I would buy more. I think the fact that this is the main can for SOCOM and the SOPMOD program speaks for itself.
One thing I would like to ask.
If any one knows of a lube that is aqueous based and that will not burn up from the heat of firing suppressed, please IM, post, or email me the name brand.
Marco
1. The gas blow back that comes out of the ejection port sinks like shit. Thank God for the PRI Gas-buster.
2. Lube does last as long when firing suppressed.
3. The can gets HOT and the rifle will get hotter than normal.
4. 5.56 suppressed is still loud.
Know to the equipment:
LMT 10.5" upper
LMT FA BCG
KAC FH
KAC NT-4 QDSS
LMT BUIS
KAC RAS w/ SAS lower
Aimpoint M3 on Larue mount
SF M951C
LMT lower
LMT 2-stage trigger
LMT SOPMOD
H Buffer
Larry Vickers 2pt sling
Slip 2000 lube
http://i17.photobucket.com/albums/b51/ic_guerrero/IMG_4624.jpg
Ammo:
Hornady TAP 75gr 5.56mm
BH 55gr red box
http://i17.photobucket.com/albums/b51/ic_guerrero/IMG_4675.jpg
KAC NT-4 QDSS
http://i17.photobucket.com/albums/b51/ic_guerrero/IMG_4680.jpg
What came in the box: Can, shim kit, KAC FH, small bottle of Rocksett and owners guide.
http://i17.photobucket.com/albums/b51/ic_guerrero/IMG_4681.jpg
http://i17.photobucket.com/albums/b51/ic_guerrero/IMG_4682.jpg
Pic of baffles
On my first outing I fired 300 rounds of 5.56 TAP at 50 yards and 100 yards. The accuracy of the rifle didn't change with the suppressor on at 50 yards but it did open up and shot lower at 100 yards. After shooting the 300 rounds and letting the suppressor cool down I was able to remove with out using any tools. One thing I did notice was that the rifle started short stroking right around 200 rounds. I added more lube to the BCG port holes but it didn't get rid of the problem. The other thing that I noticed was that it sent a lot of carbon fouling into the magwell which tarnished the ammo (see pics below). When I got home and started to clean the rifle I realized that running a suppressor on a SBR gets the BCG, bore, and everything else extremely DIRTY!!
On the second trip to the range I fired a string of 200 rounds of Black Hills 55gr Red Box. On the second trip I made sure that the BCG and the buffer tube spring where generously lubed. I didn't try to readjust the zero for the 55gr, so I don't have an accuracy report, but it shot well enough for 50 yards. Removing the suppressor the second time was a bitch. I had to use my Leatherman and Slip Carbon Killer to get it off. Clean up was much easier this time around, but I still had some short stroking issue.
http://i17.photobucket.com/albums/b51/ic_guerrero/IMG_4685.jpghttp://i17.photobucket.com/albums/b51/ic_guerrero/IMG_4686.jpg
Pics of FH after second outing
http://i17.photobucket.com/albums/b51/ic_guerrero/IMG_4684.jpg
The threads that you see in the pic are supposed to help breaking up the carbon fouling when removing the suppressor
http://i17.photobucket.com/albums/b51/ic_guerrero/IMG_4678.jpg
http://i17.photobucket.com/albums/b51/ic_guerrero/IMG_4676.jpg
Pics of carbon fouling on mags
http://i17.photobucket.com/albums/b51/ic_guerrero/IMG_4672.jpg
Top row is BH red box that was left in the last mag and bottom row was all of the ejected rounds from "tap rack bang" when it was short stroking
http://i17.photobucket.com/albums/b51/ic_guerrero/IMG_4677.jpg
Same ammo, primer views
http://i17.photobucket.com/albums/b51/ic_guerrero/IMG_4687.jpg
http://i17.photobucket.com/albums/b51/ic_guerrero/IMG_4689.jpgRifle and rig
PROS:
-Easy to make follow up shots
-Quiet enough to use with out hearing protection
-Reduced recoil (not that it was a problem before)
-QD mount is easy to use with bare hands or when using thin gloves (flight gloves)
-GWOT tested and approved
CONS
-weight (lighter can available from other manufactures)
-QD lever can be hard to move after a long string of fire
-rifle gets very dirty and lube won't last as long
-can gets HOT!!! (this is with all cans)
Overall this is a great can. If I could afford more I would buy more. I think the fact that this is the main can for SOCOM and the SOPMOD program speaks for itself.
One thing I would like to ask.
If any one knows of a lube that is aqueous based and that will not burn up from the heat of firing suppressed, please IM, post, or email me the name brand.
Marco