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Posted: 5/26/2003 7:24:10 PM EDT
I have seen posts that the SPR uses a "medium" profile barrel rather than the 1" under the handguards of most heavy barrels. What is the diameter of the SPR barrels under the handguards. I know you have to keep some meat around the chamber area, but how heavy is the SPR barrel?

Thanks,

IDHunt
Link Posted: 5/31/2003 1:33:24 PM EDT
I did some digging around and I got some measurements on the SPR barrels. They are approximately 18" long which everyone knew. The diameter under the handguard is .850". They step down to .750 under the gas block like a standard barrel. I am having this done to a SS match barrel. We figured it out and it should save somewhere between 1.00-1.25 lb. by turning down the barrel and lopping it off to 18". I don't know if this is useful information, but I figured I would post it since I dug it up. IDHunt
Link Posted: 6/1/2003 6:16:16 AM EDT
0.85"? That happens to be the diameter I had [url=http://www.ar15.com/forums/topic.html?b=3&f=118&t=151451&w=searchPop]mine[/url]turned to, but I am not sure that is the "official" diameter. Personally, I spec'd that for lighter weight and portability. Those who know, like Wes at MSTN, aren't talking...
Link Posted: 6/1/2003 6:50:11 AM EDT
BSBG, That is the official profile. I was able to find a buddy with one of the CLE SPR barrels on hand and he was able to use the calipers on it for me [:)] You got to love the internet and the ability to talk with friends from all over the world. IDHunt
Link Posted: 6/1/2003 6:59:24 AM EDT
Originally Posted By IDHunt: BSBG, That is the official profile. I was able to find a buddy with one of the CLE SPR barrels on hand and he was able to use the calipers on it for me [:)] You got to love the internet and the ability to talk with friends from all over the world. IDHunt
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And to think I just plucked that number out of the air (actually, it was hours of deliberation)...
Link Posted: 6/1/2003 7:40:57 AM EDT
bsbg, I came up with that number too. I studied some pics I found on the internet of an SPR pulled apart and used my photo program to get the dimensions. I was going to have the barrel turned, but figured I should email a few people and see if I could find out what the real deal was. I guess great minds think alike. I am thinking about turning a 16" heavy bushy barrel down to .850 under the handguards also. Put a free float RAS on it and make a nice carbine length rifle too. I have too many projects and too many AR parts sitting around. They keeps on giving me new ideas. IDHunt
Link Posted: 6/3/2003 6:32:35 AM EDT
I wouldn't call .85" under the HGs "medium" profile. IIRC my Bushmaster and Colt HBARs are about .9" (or 7/8") under the HGs so .85" wouldn't save hardly any weight over a heavy barrel. I'd call .75" full length mid-weight, and the ~.63" of the A2 or A1 barrels lightweight.
Link Posted: 6/3/2003 1:33:44 PM EDT
Originally Posted By Mike_L: so .85" wouldn't save hardly any weight over a heavy barrel.
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Remember, PI are square, not round (bad engineer joke). Compared to a typical 1" [i]match barrel[/i], 0.85" saves you about 27% of the weight. Compared to a 0.9" barrel, the difference is 10%. Less than 3/4 the weight sounds like an appreciable amount to me.
Link Posted: 6/3/2003 1:42:34 PM EDT
Remember, PI are square, not round (bad engineer joke).
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Silly engineer, pie are round. Cornbread are square. (I'm an engineer too.) I'd still call .85" under the HGs heavy, but it is lighter than a 1" competition barrel.
Link Posted: 6/3/2003 7:54:53 PM EDT
[Last Edit: 6/3/2003 7:55:53 PM EDT by MSTN]
Link Posted: 6/4/2003 10:35:10 AM EDT
A pound difference in weight? So the difference between SPRs is more than just the parts sources and who put them togeather? The Mod 1's are usually the ones you see with telestocks correct? And the Mod 0's sort of visually resemble the Mk 11 Sniper rifle with a A2 stock and all, right?
Link Posted: 6/4/2003 6:16:25 PM EDT
[Last Edit: 6/4/2003 6:25:55 PM EDT by MSTN]
Link Posted: 6/5/2003 10:06:18 AM EDT
[Last Edit: 6/5/2003 10:12:43 AM EDT by ArmdLbrl]
Originally Posted By MSTN: BOTH THE SPR MK 12 MOD 0 AND MOD 1 START OUT ON M16A1 LOWERS. WHAT HAPPENS TO THE BUTTSTOCKS AFTER ISSUE IS OPEN ENDED. HERE ARE THE DIFFERENCES, AS BEST I CAN RECOUNT- MOD 0: PRI GEN II FOREND PRI FLIP UP FRONT ARMS SPR RAIL ARMS #40 ARMS #22 MEDIUM RINGS STOCK M16A1 TRIGGER MOD 1: KAC FF RAS FOREND KAC 600-METER FLIP UP REAR KAC FOREND RAIL FLIP UP FRONT KAC SEMI 2-STAGE/FULL AUTO SINGLE STAGE TRIGGER ARMS #22 HIGH RINGS THEY BOTH HAVE: LEUPOLD TS-30 A2 M16 BOLT CARRIER PRI GAS BUSTER CHARGING HANDLE SPR BARREL FROM DOUGLAS SS BLANK OPS INC 2-PORT BRAKE & BARREL COLLAR OPS INC #12 SPR SOUND SUPPRESSOR ERGO PISTOL GRIP WES GRANT [URL]MSTN.BIZ[/URL]
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Oh, so the stock choice is left up to the unit/user. And I was wrong, its seems its the mod 1 that, if fitted with a A2 stock, would visually be the most similar to a Mk11. BTW I bookmarked this so I won't have to ask this again.
Link Posted: 6/5/2003 5:08:13 PM EDT
I spoke with Eric from VLTOR Weapon Systems at the Spokane, WA gunshow about the VLTOR stocks. He told me that Delta was using his Clubfoot Carbine Modstock on their 18" rifles. I would assume this would be the SPR. He said they liked it because it gave a stable platform for optics but allowed them to collapse the stock for MOUT and CQB type operations. This is something that was passed on in conversation and I have no way to verify it. IDHunt
Link Posted: 8/17/2003 11:19:14 PM EDT
Originally Posted By MSTN: EDITED TO ADD: THE SPR BARREL IS LESS THAN 0.85" IN DIAMETER.
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Wes, any chance for more detailed numbers? Thanks a lot Cato
Link Posted: 8/18/2003 3:36:10 AM EDT
Link Posted: 8/18/2003 6:13:53 AM EDT
Now, you just knew that was coming. hahahaha!
Link Posted: 9/4/2003 11:29:43 PM EDT
.82?
Link Posted: 9/20/2003 6:13:01 PM EDT
the specs i came up with are .98 steped down to .82 to .75 i have 2 krieger barrels and one is heavey and the other spr both are spr length the profile makes a big difference in weight .
Link Posted: 9/20/2003 7:12:17 PM EDT
Any chance of Wes selling the OPS INC 2-PORT BRAKE & BARREL COLLAR seperate?? FREE
Link Posted: 9/21/2003 6:38:04 AM EDT
Link Posted: 9/21/2003 6:48:24 AM EDT
Is that the Les Baer bolt? Or the LMT? [:D]
Link Posted: 9/21/2003 7:02:01 AM EDT
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