Finally got around to installing my Vltor A5 stock system the other day on my SBR in lieu of the Magpul UBR. My SBR is a self built 11.5" from BCM with an AAC M4-2000 suppressor and 4x32 ACOG.
So today markm and I went out to one of our usual spots to do some testing now that the good weather is in full effect. I didn't know what to expect and I will say that I was somewhat surprised.
We fired a variety of ammo and used 3 different buffers. To the best of my knowledge we had zero issues with cycling. The ammo used was as follows;
1. Lake City M855 FMJ.
2. Hornady 75gr. steel case TAP.
3. Hornady 55gr. steel case TAP.
4. Swiss RUAG 55gr. M193 clone.
5. Markm hand rolled .223 55gr. magic ammo.
It fired very smooth and when doing hammer pairs and controlled pairs I could tell the difference from the previous set up using the H3 buffer.
We also dropped his BCM 14.5" middy upper onto my lower and it ran like a champ. Very smooth and easy to control. However, we did have to use the lighter buffer.
The second part of the test (this is a two for one special) was to test POI shift when using/ removing the suppressor. I know the topic has come up several times in the past so I wanted to share my experience and thoughts. Having said that I am not a mathematician so I'll let you guys determine how much shift there was.
Attachment 7716
We started the testing by firing unsuppressed at 50 yards in the prone position using a back pack as the shooters support. I fired a total of ten rounds. This group was fired using Hornady 55gr. steel TAP.
Attachment 7717
This next group of 10 was fired suppressed.
Attachment 7718
This group of 10 was fired suppressed using Hornady 75gr. steel case TAP.
Attachment 7719
This group of 10 was fired unsuppressed.
Attachment 7720
Summation: I chose 50 yards because I feel that it represents an accurate distance at which a civilian or LEO may engage someone. As you will see the shift in my opinion is small enough that it shouldn't be a concern.
I may push out to 100 yards next time and see if that makes a bigger difference.
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