AR-15 22 rimfire conversion test. - RimfireCentral.com Forums

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  #1  
Old 09-01-2016, 09:42 PM
VASCAR2
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AR-15 22 rimfire conversion test.



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Frequently forum members bring up the question as to how accurate are 22 LR conversions in AR-15's. I decided to conduct a quick test to give an indication of the practicality of using a 22 LR conversion. The biggest down side to using 22 LR conversions in AR-15's is the filth left in a centerfire rifle from shooting 22 rimfire. A 22 conversion generally is not as accurate in centerfire 223/5.56 barrels because 22 rimfire bullet is .223 diameter and 223/5.56 is .224. Rimfire ammo is usually shot in 1:15 or 1:16 twist barrels whereas my AR-15's are 1:9 and 1:7 twist. Older AR-15's were 1:12 and some Wylde barrels use 1:8 twist.

I decided to shoot five firearms today in this test. All rifles were shot at 50 yards off my MTM bench using a bipod and rear sand bags. All rifles were shot with the scope set on 9 power. Below is a list of the firearms.

Savage Mark II FV heavy barrel with Famous Maker 3-9 AO scope.

DPMS 16" bull barrel Gen I with Tasco 2.5-10X44 scope.

KKF 16" 1:16 twist barrel with Ciener conversion, Tasco 2.5-10X44 scope.

Colt 20" H-Bar 1:9 twist 5.56
Chrome Moly, Famous Maker 2.5-10 AO scope.

PSA 16" 1:7 twist 5.56 Stainless Steel, 2.5-10X44 scope.

The only modification to the Savage was free floating the barrel and torquing the stock to the proper spec. The Colt, PSA and the KKF all have RRA NM trigger groups except my DPMS 22 LR which has a Geissele G2S.

I decided to use the same ammo in each firearm and used five shot groups. All shooting was done in one afternoon and the wind was blowing from the North east from 12-16 MPH with gust at 20+ MPH. I was shooting southeast so there was a 1/4 wind value which didn't seem to affect groups. Temperature was 75-80 degrees through the afternoon with 30.07 barometric pressure, 50% Humidity dew point 58 degrees. The elevation is 450' ASL.

The ammo used in the test was shot in the following order in all firearms.

Eley Club 40 grain RNL standard velocity

CCI 40 grain RNL Standard Velocity

CCI Blazer 40 grain RNL High Velocity

Federal Game Shock 40 grain plated RN High Velocity

Aguila Super Extra 40 grain plated RN High Velocity.

I used an older box of Winchester Wildcats to sight in a couple of rifles. The KKF and PSA used the same scope. I used the same scope setting and was shooting for groups not particularly at the small black rectangle drawn on white 9" paper plates which was an aiming point. I shot one group with the Wildcats in the PSA 1:7 twist barrel to show the variability ammo has on groups.

This is a picture of the Savage Mark II


10C1F0DD-B141-4F8D-8078-DA190CB82F3D by [url=https://www.flickr.com/photos/[email protected]/]



Here is a picture of the DPMS Bull barrel Gen I AR-15.


AC5B8491-033D-4EEE-82E1-77E35CD6243F by [url=https://www.flickr.com/photos/[email protected]/]

Last edited by VASCAR2; 09-23-2017 at 08:06 PM.
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  #2  
Old 09-01-2016, 09:44 PM
VASCAR2
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Part 2

Here is a picture of my KKF 16" 1:16 twist 22 LR, barrel has a modified barrel extension to accept any 22 LR conversion kit, I used a Ciener kit and BDM Mag today. This picture was from a later date as I lost my original picture to photobucket debacle the rifle is the same but with a different scope.


1E4F84D6-8398-4ECC-B3A3-AF601AA7A8CE by [url=https://www.flickr.com/photos/[email protected]/]



This photo is of the Ciener conversion and BDM magazine which was used in the KKF upper in the Colt and PSA AR-15's.


FF996937-265F-4BB2-9F2C-47A2AB8EFEB8 by [url=https://www.flickr.com/photos/[email protected]/]


This photo is of the Colt 20" H-Bar, the Colt has a RRA scope mount which is the same mount used with the Tasco 2.5-10X44 scope which was used on the KKF & PSA.


D17171B2-E908-4BEE-B301-02D534DDF149 by [url=https://www.flickr.com/photos/[email protected]/]

This photo is of the PSA 1:7 twist SS rifle which used the Ciener conversion.

1090DC2B-3C07-4B43-8AD7-34BCEDE1DEFE by [url=https://www.flickr.com/photos/[email protected]/]

Last edited by VASCAR2; 09-23-2017 at 08:07 PM.
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Old 09-01-2016, 09:50 PM
VASCAR2
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Part 3

Now for the pictures of the targets. This picture is of the target shot by the Savage. The targets were shot in the following order, Eley Club center rectangle, CCI SV upper left, Blazer upper right, Federal Game Shock lower left and Aguila SE lower right.


6B681563-6F14-47B7-9B6E-C78CAB735699 by [url=https://www.flickr.com/photos/[email protected]/]

This target was shot with the DPMS Gen I. A standard mil spec trigger really hurts the potential accuracy of this rifle. It shot a lot better with the RRA NM trigger.

7C69F62A-2933-4765-92A3-7EA1CFFE93DA by [url=https://www.flickr.com/photos/[email protected]/]


This target was shot with the KKF barrel with Ciener bolt with chamber insert.

4877D701-C073-440A-A6D0-5F999E8823DE by [url=https://www.flickr.com/photos/[email protected]/]

Last edited by VASCAR2; 09-23-2017 at 08:09 PM.
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  #4  
Old 09-01-2016, 09:52 PM
VASCAR2
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Part 4

These Five pictures are the groups shot with Colt 1:9 twist chrome moly 5.56 barrel.

I shot the first five rounds of Ely club without cleaning the barrel which was fouled from shooting 223/5.56. I shot a second group aiming at a staple for comparison to the very first five rounds of rimfire. The last five of Eley club were shot after the Aguila.

80402CBA-E749-4FB5-83D4-F58F49AD3901 by [url=https://www.flickr.com/photos/[email protected]/]

CCI Standard Velocity 40 grain RNL.

D51EAFD9-473B-4ABD-9664-8293BDCCE12A by [url=https://www.flickr.com/photos/[email protected]/]


CCI Blazer 40 grain RNL


4C5D3911-5C02-4292-A0FD-9B19F97FC402 by [url=https://www.flickr.com/photos/[email protected]/]



Federal Game Shock 40 grain Plated RN HV. This shot better than the typical 36 grain HP 550 bulk.


8DE09B6C-E37E-494A-939E-B5E8C106F052 by [url=https://www.flickr.com/photos/[email protected]/]


Aguila Super Extra 40 grain plated RN High Velocity. I shot a second group with the Aguila as the first group wasn't typical for how Aguila SE shoots in my conversions. I used a different aiming point and the second group was better. Conversions don't show the consistency of dedicated 22 LR uppers.

7E87079C-DE97-4D20-A853-FD7DC7A4B4DD by [url=https://www.flickr.com/photos/[email protected]/]

Last edited by VASCAR2; 09-23-2017 at 08:10 PM.
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  #5  
Old 09-01-2016, 09:59 PM
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CSPCRX
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Thanks for posting this. I have been kicking around the idea of building or buying a 22lr upper with 22lr barrel. Part that shocks me is how much they are, $500 or more for complete 22lr upper. You can get M&P 15/22 for less than $400.

I like the idea of the 22lr upper because I can just us my lower and have same feel. I looked for parts to build one and don't see it being any cheaper.
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Old 09-01-2016, 09:59 PM
VASCAR2
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Part 5

These six photos show the groups fired with the PSA 16" 1:7 Stainless Steel barrel with Ciener conversion. Surprisingly I only experienced one stove pipe jam through the course of the whole day. I normally don't shoot much standard velocity but it functioned 100% today.

The Eley Club, the PSA 1:7 is a new rifle with less than 20 centerfire rounds throughthe barrel. I cleaned the PSA barrel prior to shooting the rimfire.


E4416A59-AE5F-4614-AC57-DA159EEB0F4E by [url=https://www.flickr.com/photos/[email protected]/]


CCI Standard Velocity 40 grain RNL.

6B728E67-99A3-48F7-A0D5-147103DB3C9E by [url=https://www.flickr.com/photos/[email protected]/]

CCI Blazer 40 grain RNL High Velocity.


57FB1D6F-7AF1-4D5E-BA46-AAD7EF1A6470 by [url=https://www.flickr.com/photos/[email protected]/]



Federal Game Shock 40 grain Plated RN High Velocity. I decided to shoot two groups as the first group wasn't that good. I used a different aiming point and had five rounds at the top edge of the target. There are three bullet holes right together.


C23B3548-86A6-4365-A820-E71FA1C57338 by [url=https://www.flickr.com/photos/[email protected]/]



Aguila Super Extra 40 grain plated RN High Velocity.


E96E42DB-DDAF-4927-B61C-C34D3C26A79C by [url=https://www.flickr.com/photos/[email protected]/]




Winchester Wildcat 40 grain RNL. I used this ammo to get a rough zero with the scope on the PSA and noticed it group pretty poor. I shot this group to show what happens if your barrel does not like a particular brand/type ammo.



83F884B4-5B18-4424-8153-7695A257A057 by [url=https://www.flickr.com/photos/[email protected]/]

Even as bad as the Wildcats did in this group this would still be adequate accuracy for shooting CQB at steel targets at 25 yards. The conversion kits work good enough to provide adequate accuracy for shooting paper or steel targets for CQB or plinking.

Most 5.56/233 barrels produce fliers which ruins groups when using 22 rimfire conversions. I've used 1:12 chrome lined 20" 5.56/223 barrel with a Ciener conversion and depending on ammo it was a little better than my 1:9 twist barrels. This was an A-2 upper with fixed carry handle so I didn't test it with a scope. I've shot 22 rimfire through Stainless Steel 1:8 twist Wylde chambered 5.56/223 barrels and the results were similar to my 1:9 twist chrome moly and chrome lined 16" barrels.

Last edited by VASCAR2; 09-23-2017 at 08:12 PM.
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Old 09-03-2016, 08:17 AM
mscarbrough
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I spent 500 for a tactical solutions and have been extremely happy. My groups are consistently 1/2 moa when I feed it the right stuff.
I know I could have gotten an entire 22 but l like the idea of being able to throw an upper on the lower and have a fully functional AR. So I got a high grade 22 and a custom AR for about 1200. Not to bad in my mind.

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