Quoted: Adco, JTAC, and MSTN are the only ones that come to mind with true SPR barrel profiles. G&R might have them also, but I'm not sure about the SPR profile.

I have 18" Noveske SPR barrels (chrome Moly).



C4

www.GRTactical.com

Quoted: I need a true SPR cut barrel.  I need M4 feed ramps too...any leads?

WE HAVE OURS DONE TO THE SAME GOV'T DRAWINGS, IN THE SAME DOUGLAS PREMIUM STAINLESS 1X7" BLANKS, AS BARNETT USED TO MAKE THE GOV'T SPR BARRELS.

OUR SHOULDER FOR THE OPS-INC BARREL COLLAR IS RIGHT WHERE IT SHOULD BE, ACORDING TO THE DRAWINGS, IF THAT'S WHAT YOU'RE AFTER.

DIFFERENCES:

1. GENE BARNETT DID THE GOV'T SPR BARRELS. WE USE COMPASS LAKE TO TURN OURS.

2. THE REAL GOV'T BARRELS USED A PROPRIETARY A.M.U. CHAMBER. OURS USE COMPASS LAKE'S PROPRIETARY MATCH CHAMBER.

3. THE REAL GOV'T BARRELS DID NOT HAVE INDIVIDUALLY FITTED BOLTS. OURS DO.

4. THE REAL GOV'T BARRELS USE A 45 DEGREE CROWN. COMPASS LAKE DOES AN 11 DEGREE TARGET CROWN.

5. THE REAL GOV'T SPR'S HAD TO DO 3-SHOT 1.25 MOA GROUPS TO QUALIFY. THE DOZEN SPR'S WE HAD BUILT BY THE SAME GUY WHO BUILT THEM UNDER CONTRACT FOR CRANE DID A 0.91 MOA AVERAGE. OUR SPR'S HAVE TO SHOOT 5-SHOT SUB-MOA GROUPS TO PASS OUR MUSTER BEFORE WE SHIP. THEY AVERAGE ABOUT 0.75 MOA. WE DO SEE SOME FREAKS IN THE SUB HALF-MOA RANGE.

THE NOVESKE 18" SPR BARREL IS ALSO 18" IN LENGTH, BUT A IS A MID-LENGTH GAS SYSTEM, AS OPPOSED TO A RIFLE LENGTH GAS SYSTEM LIKE THE GOV'T SPR BARREL. NOVESKE USES PAC-NOR BLANKS AND HIS OWN PROPRIETARY CONTOUR, WHICH I LIKE. WE HAVE THEM IN STOCK, AS WELL. I PLAN TO DO MY NEXT PERSONAL BUILD WITH ONE OF THESE.


WES GRANT
M.S.T.N.

ar15.com/forums/topic.html?b=2&f=134&t=141314

AS YOU CAN SEE, WE'VE BEEN DOING THIS FOR A WHILE.

WES GRANT
M.S.T.N.

IT'S MORE OF A SHOULDER OF 0.010" RADIUS.

THE OPS-INC BARREL COLLAR IS A FRICTION FIT FURTHER SECURED VIA A TINY ALLEN SCREW. I ALWAYS USED LOCTITE, AS WELL.

IT IS A FIRST CLASS BITCH TO FIT AND NOT SCREW UP THE BARREL'S KG COATING. I DO NOT MISS DOING THAT PART OF BUILDING UPPERS AT ALL.

WES GRANT
M.S.T.N.

PETE-

BEST OF LUCK. AS FAR AS I KNOW, THERE HAVE ONLY BEEN 25X MADE IN 6.8 SPC BY OPS-INC, AND WE GOT ALL OF THEM.

UNCLE SAM USES SPR-V .30 CAL BRAKES ON HIS 6.8 SPC'S.

S/F-

WES

OUR DOUGLAS (BY COMPASS LAKE ENGINEERING) S/S 16" 6.8 SPC BARRELS ARE SET UP TO BE USED WITH THE OPS-INC 12TH MODEL SOUND SUPPRESSORS. THEY HAVE THE SHOULDER FOR THE BARREL COLLAR AT THE CORRECT LOCATION. THESE BARRELS ARE THE CORRECT GOV'T CONTOUR, EXCEPT FOR THIS SHOULDER, WHICH WE CHOSE TO ADD.

OUR DOUGLAS 18" SPR AND LILJA RECCE MOD 1 5.56MM BARRELS, BOTH ALSO TURNED BY COMPASS LAKE, HAVE THE SHOULDER FOR THE BARREL COLLAR. WHILE IT IS IN THE SPECS FOR THE 18" 5.56MM SPR BARREL, WE CHOSE TO ADD IT TO OUR PROPRIETARY 16" RECCE CONTOUR.

OPTIMALLY, AN 18" 6.8 SPC BARREL USES A MID-LENGTH GAS SYSTEM, AS OURS DO. WE CURRENTLY HAVE NOVESKE 18" 6.8 SPC BARRELS IN STOCK. THEY ARE EQUIPPED WITH A 0.7495" BARREL DIAMETER JUST FORWARD OF WHERE A 12" FOREND WOULD TERMINATE, IF ONE WISHES TO USE THE PRI FLIP UP FRONT SIGHT ASSEMBLY AT THAT POINT.

WE ALSO HAVE NOVESKE 12" AND 16" 6.8 SPC BARRELS IN STOCK, BTW. ALL NOVESKE 6.8 SPC BARRELS WE STOCK UTILIZE PAC-NOR S/S BARRELS WITH 1X10" TWIST AND POLYGONAL RIFLING.

WES GRANT
M.S.T.N.

ALL I HAVE LEFT IN OPS INC BRAKES ARE 4-PORT .30 CAL, K-G KOTED, THREADED 5/8X24.

NO LEADS ON ANY MORE, EITHER.

AFTER TRYING ALL OF THE AVAILABLE MUZZLE DEVICES ON 16" AND 18" 6.8 SPC BARRELS, OUR MSTN QC BRAKE IN 6.8 SPC IS MY CHOICE. ON THE 12", HOWEVER, THE NOVESKE KFH/KX3 IS MY RECOMMENDATION, IF YOU VALUE YOUR HEARING.

S/F-

WES