Re: Trying to decide which can to buy for AR.
Wrote this on another site.....Maybe you will find some of the info useful:
Just my thoughts, base on my needs, and what I feel is important:
When selecting a suppressor, point of impact shift, type of mount, weight, and length of the suppressor are <span style="font-weight: bold">my</span> main concerns. Cost and noise reduction are the lowest on <span style="font-weight: bold">my</span> list of concerns.
When noise reduction is mentioned, a lot of guys will make a mountain over a mole hill in reference to a couple decibels. As long as the suppressor doesn't seem loud to me and I can shoot it without hearing protection, <span style="font-weight: bold">I'm</span> good to go.
1) <span style="font-weight: bold">Point of Impact Shift </span> - Something that I did not realize when I purchased my first suppressor was how much a suppressor effects the point of impact of the host gun. I had a quick detach suppressor that changed the point of impact around 4" (low and to the right) at 50 yards.
I want the ability to put the can on the gun or remove it and not have to worry about have 2 different zero's for the same gun. With or without the can, the gun should have the same point of impact.
I needed a quick detach system because there are times when I don't want to use a suppressor (ie. vehicle ops, high round count training classes, etc) and times where I want to use a suppressor (ie. serving warrants small houses, trailers, apartments, etc).
With the Surefire 556k suppressor, using an Aimpoint and Aimpoint with 3x Magnifier, I can't tell a difference in point of impact shift. Surefire states that their can will effect the point of impact less than 1 MOA at 100 yards. I can't tell a difference in my zero with or without the can on the gun.
2) <span style="font-weight: bold">Mounting system</span> - Without getting too complex, basically there are two different types of mounting systems.
a) Quick Detach systems = the can mounts to a flash hider type mount and can easily be installed and uninstalled
b) Barrel thread system = these are suppressors that mount directly to the barrels threads. I would only use this type of can if I were going to mount it on the gun and leave it on the gun. The Gem-Tech M4-02 is a good example of a barrel thread mounting system design:
http://www.gem-tech.com/M4-02.html
When shooting with a suppressor mounted to the gun, not only will you notice that the gun get's hotter quicker, but it also get's dirtier quicker and burns off lube quicker.
Something to consider if getting a quick detach system. One of the areas that attracts carbon build up is the mounting area of the suppressor, and on most quick detach suppressors some level of cleaning and lubrication to the mounting system are required. I had a Quick Detach system several years ago, where the quick detach system within the suppressor would lock up due to carbon build up with only a couple hundred rounds and I would have to send the suppressor back to the manufacturer to get the quick detach system back in working order.
The Surefire's mounting system is pretty durable, less likely to get stuck, and even if it does get stuck, you just loosen the locking ring, fire a couple rounds through the gun and it will loosen the can. The mounting system of the 556k was another feature that I considered when looking for a new suppressor.
If you don't NEED a Quick Detach system, you may want to consider something like a Gem-Tech M4-02 which mounts directly to the barrel threads. Mount it and leave it. No point of impact shift to worry about, etc.
The M4-02 sells for approxiamtely $525. The Surefire is approximatley $1,300 and it does not come with a mount, mounts are around $100 (depending which one you get). So that's around $1,400. The M4-02 is almost 1/3rd the price.
If you don't NEED a quick detach system, but you want the ability to shoot the SBR with and without the suppressor. One option to explore would be to get 2 identical uppers for the same SBR lower. Mount the M4-02 on one upper, and no suppressor on the other.
3) <span style="font-weight: bold">Weight</span> - Weight is always a concern with suppressors. 5oz or 8oz may not sound like much, but when that weight is at the end of your barrel (furthest away from the center of gravity of the gun) the extra weight feels heavier and is much more noticable than if that weight was located at the center of the gun.
4) <span style="font-weight: bold">Length</span> - Length also needs to be considered as it effects the compactness of the overall package. Added length can also magnify the weight of the suppressor.
<span style="font-weight: bold">Surefire 556k suppressor</span>:
- Weight of just the suppressor: 16.06 ounces (just a hair over a pound)
- Length of just the suppressor: 6 and 1/4 inches
- Overall length when mounted to a 11.5" barrel: 17 and 1/4 inches
For reference I measured a Bravo Company 16" mid-lenght barrel with a USGI A2 flash hider mounted on it and it was just under 1/8" longer than the 11.5" barrel with the Surefire 556k suppressor.
For me, the Surefire 556k suited my needs better than other cans I had researched.
If I had to go out and buy another suppressor today I would purchase another Surefire 556k
I got my 556k from Grant a couple years ago and his price was much better than the advertised price......Don't know if that is still the case or not.....wouldn't hurt to check if you are in the market for a 556k.
Figure out the following and get the best suppressor that fits within these parameters
1) How much do you want to spend
2) What are your needs
3) What features are most important and least important to you (ie. is sound reduction more important or is lack of impact shift more important)
Same gun with and without the 556k:
Good luck