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Colt Series 70 build

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chiz1180
lablover
john bickar
james r chapman
Jon Eulette
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jim fabanich
af_one
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Colt Series 70 build Empty Colt Series 70 build

Post by af_one 8/15/2020, 8:30 am

This 1981 produced Colt was built by USMC armorers for a Captain to compete in Quantico matches.
Full Bomar rib and sights with extended front, Barstow match grade barrel,NM bushing, speed hammer and Videcki trigger, smaller GI safety, extended mag well,and more, very smooth and very tight build.  Very few rounds other than test firing as condition indicates.
$975 free shipping
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Last edited by af_one on 9/23/2020, 8:04 am; edited 2 times in total (Reason for editing : free shipping added)

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Post by jim fabanich 8/19/2020, 9:59 am

Any idea of the test groupings when built?

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Post by af_one 8/19/2020, 5:37 pm

I have not fired it, and I don't have any test targets.  The parts and quality of the build would suggest 2" gun or better

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Post by LateBoomer 8/19/2020, 6:33 pm

Cool gun. Is there any documentation that validates the USMC lineage and work done by a Quantico based armorer? Approx Year?

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Post by LateBoomer 8/19/2020, 6:34 pm

Sorry, just saw 1981

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Post by af_one 8/30/2020, 8:06 pm

UPDATE: I had never fired this Colt and thought it would help to showcase this gun.
10 shots from my rest produce 1.45" group at 50 yards.  I know the gun can do better if in a ransom rest, so this ones a shooter.  My 50 yard load:

200 grain Lead Semi-Wadcutter 
4 gr Bullseye 
.470 - .472 crimp
.025 - .030 shoulder vice OAL
Federal Gold Medal Match Large Pistol Primers 
Starline Brass 

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Post by zanemoseley 8/30/2020, 8:56 pm

It's crazy the amount of amazing pistols turning up these days and not selling quick. This looks like an amazing buy. Too bad I don't have enough cash for them all.

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Post by Jon Eulette 8/30/2020, 9:49 pm

Surprised that loose of a crimp didn't scatter them at 50 yds. That's almost no crimp at all. Was group shot with irons?
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Post by zanemoseley 8/30/2020, 9:56 pm

True, I'm down to .463" but no more than .469" with lead.

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Post by james r chapman 8/31/2020, 4:57 am

Love to see a closeup of those .472 crimped cartridges.
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Post by af_one 9/12/2020, 12:29 pm

Bump for price reduction

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Post by john bickar 9/12/2020, 3:11 pm

A 1.5" bullseye gun at that price is a smokin' deal!
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Post by lablover 9/12/2020, 4:09 pm

Sharp pistol for sure.  Looks like a Bomar tuner?  Guess you could take that off and mount a rib.

Is a rib like that legal for CMP EIC ?
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Post by chiz1180 9/12/2020, 4:22 pm

lablover wrote:Sharp pistol for sure.  Looks like a Bomar tuner?  Guess you could take that off and mount a rib.

Is a rib like that legal for CMP EIC ?

Rib is not legal for EIC, See rule 4.1.2 for allowable EIC modifications. Rule 4.1.1 i) specifically prohibits extended front sights.


Last edited by chiz1180 on 9/12/2020, 4:27 pm; edited 1 time in total (Reason for editing : more info)

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Post by MarkOue 9/12/2020, 5:18 pm

PM sent

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Post by af_one 9/12/2020, 10:20 pm

It is a Bomar Tuner Rib

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Post by Jon Eulette 9/12/2020, 10:38 pm

af_one wrote:It is a Bomar Tuner Rib
Is the tuner being used to support the hood of the barrel or is it just there as a filler because a Barsto barrel was fit?
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Post by af_one 9/23/2020, 8:03 am

Free shipping to your FFL included

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Post by Jon Eulette 9/23/2020, 9:07 am

Jon Eulette wrote:
af_one wrote:It is a Bomar Tuner Rib
Is the tuner being used to support the hood of the barrel or is it just there as a filler because a Barsto barrel was fit?
Jon
Good Morning. This is important question. Is barrel being locked up by the tuner?
Thanks
Jon
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Post by Jwhelan939 9/23/2020, 9:44 am

I would also like to know the answer to John's question. Also, where in PA are you located?

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Post by af_one 9/23/2020, 11:44 am

I do not believe its being locked up by the tuner--western PA

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Post by Jon Eulette 9/23/2020, 11:56 am

If you loosen the tuner and there in no vertical play between barrel and slide (slide stop pin) then barrel was fit to the slide and not using the tuner; typically tuner built guns will have loose barrel when tuner is loosened up.
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Post by bluemalibu111 9/23/2020, 1:27 pm

What does all that mean?

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Post by Jon Eulette 9/23/2020, 1:52 pm

Colt BE builds of old/past used stock barrels that were welded up and refit to the pistol for accurizing into BE pistol. The upper barrel lugs will still be undersized and the barrel will sit high in the slide. Now you have potential issues with off center firing pin strike and the need for a really long barrel link. The accuracy tuner from Bomar rest on top of the barrel hood and kept the barrel from setting too high in the slide. Unfortunately you lose upper lug lockup into the slide and the pistol will recoil harder from not being able to keep the pistol in battery as long as a fully engaged locking lug like a modern barrel provides. Also the barrel will wear the slide locking lugs unevenly. I see this regularly when I rebuild/rebarrel older tuner guns. The Kart XAct fit barrel does the same thing. Less lockup equals more felt recoil. I hope this answers your question.
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Post by af_one 9/23/2020, 3:22 pm

heres the definite answer:  I just removed the tuner plug completely, and the barrel is tight--zero movement.  The Barstow barrel is fit to the gun.

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