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What is the rifling twist in a 20 inch barreled Colt SP1 AR 15?
Wiki User
∙ 11y ago
It should be stamped on the barrel. If it's a 1 in 7 twist, it will read 1:7.
Wiki User
∙ 11y ago
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What is the rifling twist in a 20 inch barreled Colt SP1 AR-15?
1-7 twist
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You will need to call Colt to find out.
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Why does the M193 and m196 ammunition lose its accuracy and lethality beyond 300 meters when fired from the M4?
The original M16 had a 20 inch barrel, whereas the M4 has a 14.5 inch barrel. The longer barrel of the M16 gave the round a higher velocity than the short barrel of the M4 does. However, according to military specs, the maximum effective range of the M4 against a point target is only 50 meters less than that of the M16, and the maximum effective range against an area target is unchanged. And I've just noticed you said M193 ammunition, and not SS109/M855. It should also be noted that the M16A1 and XM177 had a 1 in 12 inch twist rate, designed to stabilise the lighter 55 grain M193 cartridge, whereas the M16A2, M16A4, and M4 carbine have a 1 in 7 inch twist rate. Part of the reason for this change is rifling was to better stabilise the 62 grain SS109/M855 cartridge, although the specific twist was chosen for its ability to stabilise the 64 grain M856 cartridge, and can also be used with the 77 grain Mk 262 special ball cartridge. However, 1 in 7 is a bit fast of a rifling twist for the lightweight M193 cartridge. Although you can fire the M193 through a 1:7 barrel, the fast twist of rifling causes excessive spin with the lighter cartridge, which have the overall effect of reducing the round's stability and altering the terminal ballistics.
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Yes
What is a colt 38 caliber rifle?
It would be a rifle (long barreled firearm with spiral grooves cut on inside of barrel) made by Colt company, that fires a bullet 38/100ths of an inch in diameter. If you really meant what is it worth- that will depend on the exact model, condition, and originality. If you will post again with additional information, we will see if we can find a ballpark value- but a hands-on appraisal by a knowledgeable person will be much more accurate.
When was it manufactured colt police 38 4 inch barrel serial number 741978?
Proofhouse.com has Colt sn data.
32 cal long colt police positive colt 4 inch barrel seral no 80386 can you tell me when it was made?
Try here http://proofhouse.com/colt/
