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I received my DSB barrel. The barrel seems well made. 7.5” long and 1:7 twist 300BLK. Looks like a ceracoted barrel but the extension is unfinished. No gas jet screws, regulator, bottom rail, or rail support is included. Luckily I have a stash of parts and found a 16/17 gas piston assembly, regulator, and bottom rail support. I ordered the PMM MLOK bottom rail to differentiate the DSB barrel from stock.
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A difference between the FN and DSB barrels is that the stock gas piston on the 15P is larger than the 16/17 piston sized gas block on the DSB.
According to DSB, the black plastic shuttle in the 15’s receiver isn’t needed and because the DSB extension isn’t arched like the stock barrel extension it won’t fit. DSB also states that jet screws are not needed. Instead you’ll have to open up the port on the regulator with a 3/16 end mill bit. This means the 2nd position is unusable. I may try to see if the graduated opening on the Scarburator will work instead.
A difference between the FN and DSB barrels is that the stock gas piston on the 15P is larger than the 16/17 piston sized gas block on the DSB.
According to DSB, the black plastic shuttle in the 15’s receiver isn’t needed and because the DSB extension isn’t arched like the stock barrel extension it won’t fit. DSB also states that jet screws are not needed. Instead you’ll have to open up the port on the regulator with a 3/16 end mill bit. This means the 2nd position is unusable. I may try to see if the graduated opening on the Scarburator will work instead.
Measured the DSB barrel’s gas port size at 0.142”. The max size jet screw (2.5mm) would narrow that to 0.098”. No wonder DSB said not to use any jet screws. I had a 9.5” 300BO AR that had its gas port sized to 0.093 to shoot subsonics only suppressed - suppressor was an Omega300. Supers shot fine suppressed/unsuppressed. Since I’m down 2” on barrel for this gun, I think I’ll need something greater than 0.093”. Suppressor will be a RC2.
Rather than mess with drilling a regulator, I’ve ordered the KNS DiSCARder. Seems well suited for this project. I’ll start with a 2.5mm jet screw installed but expect I’ll have to ditch any screws as DSB instructed. I’m also installing a Surefire CQB 3-prong flash hider for use with my Surefire suppressor.
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Rather than mess with drilling a regulator, I’ve ordered the KNS DiSCARder. Seems well suited for this project. I’ll start with a 2.5mm jet screw installed but expect I’ll have to ditch any screws as DSB instructed. I’m also installing a Surefire CQB 3-prong flash hider for use with my Surefire suppressor.
Received my KNS DiSCARder today and I’m impressed! It included a slotted tool to remove stock jet screws (not applicable for this project), three various sized jet screws (again unlikely needed for this project), and the regulator. The tool and screws look heat treated or TiN coated. The regulator has 13 different positions from fully vented to fully closed. The detent clicks very clearly and overall this thing feels quality. There are no instructions included. KNS expressly states that this product is NOT compatible with the 5.56 15P barrel. Worst case, I’ll throw this on my 13” 17 and resort to drilling a stock regulator as recommended by DSB. This should be interesting!
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