shooter521
Certified Glock Nut
Today my friend Doug and I were able to squeeze in a few hours at the range in between rain storms. It ended up being a mostly NFA outing, with Doug bringing his BCM 11.5" AR and Gemtech G5, and me bringing my 10.5" LMT AR, 9.5" 9mm AR, and my new Gemtech MultiMount.
10.5" LMT
I ran about 140 rounds through the gun, a mix of Wolf and Prvi Partizan 55gr FMJ. I had 2 failures to eject with the Wolf, and two failures to eject and a light strike with the PPU. I had issues like this all through the Magpul carbine course I took back in May. After the course, I changed out the extractor spring, insert and O-ring. Now I will be looking at the extractor itself and the ejector spring. I may also experiment with a lighter buffer (I'm currently running a 9mm buffer, which is about as heavy as you can go) to see if more energetic cycling will solve the problem. I fired about as many rounds of .22LR through the gun using my Ciener conversion kit, with zero problems. The new CMMG .22 magazines work great; I will be buying more.
Gemtech MultiMount
I started out with the MultiMount on my Glock 17, shooting regular 115gr FMJ as well as two types of 147gr subsonics. With the subsonic ammo, this combination is pretty quiet from the shooter's standpoint, and very quiet when observed from off to the side. There is a dramatic increase in the noise level shooting 115gr, of course, but it's all downrange (sonic crack). At the gun, the noise level remains comfortable and "hearing safe," and it was still possible to carry on a normal conversation when shooting.
Attaching the can results in a POI shift of about 1.5" low and to the right at 15 yards with subsonics, and about 1/2" with 115gr. According to the manual, you are supposed to be able to pull the can forward about 1/8" and rotate it to different indexing points within the LID mount in order to change POI for various loads, but this did not seem to have any measurable effect.
The thread mount has to be constantly checked and snugged down, or else it will back off a bit after 10 rounds or so. After 4 mags (80 rounds) of continuous firing, the can was too hot to handle, even after doubling up on shooting gloves. I'll be taking a page from bigcraig's book and adding a welding glove to my range bag soon! At that point, I was also getting some serious heat mirage off the top of the can, which made aiming difficult. As a result, my group sizes started to open up. So I put the gun down to let the can cool off before swapping the LID mount out for the 3-lug adapter and moving it over to the 9mm AR.
The MultiMount-equipped 9mm AR shooting subsonics is wicked quiet - to my ear, it's very similar to shooting standard-velocity ammo out of my suppressed .22 pistol. POI shift is also much less than on the Glock (1/2" right at 25 yards with all ammo, and groups were tight), due to the heavier, rigid barrel and more stable mounting interface. This is where the can will spend 95% of its time. We finished up the day blasting clay birds off the berm with this combo... at 100 yards!
The gun is basically shooting within the dot size (4 MOA) at that point, so it took us about 25 rounds to completely dust 4 birds. It was fun. The one thing that surprised me is how much of a thump the gun has when shooting suppressed; you can definitely tell it's cycling harder, but it doesn't really throw your aim off any because it is so fast, and straight back. If I spend a lot of time running the gun with the can on it, I might play around with an extra power recoil spring to soften the blow a bit.
BCM w/ Gemtech G5
Doug's gun runs, and runs, and runs. Always has. His setup is a lot heavier than my LMT, though, and the weight of the G5 on the front doesn't help any. It's manageable for outings like this, but I wouldn't want to do a 3-day class with it or anything. Where the gun really starts to shine is running the G5 with the Ciener .22 kit. Almost as quiet as running a dedicated .22 can, and 100% reliable. And today, to our giddy excitement, we discovered that this combo will also cycle subsonics.
I think the staple gun I used to put up the targets made more noise. Seriously.
I also got to shoot my Glock 23 and 27, which I haven't had out in months for lack of reasonably priced .40 ammo, and got the iron sights and red dot dialed in on my 10/22, which also ran well.
So we didn't get to shoot quite as much as we would have liked, we got wet, and I don't have any pics to post, but it was still WAY better than a day at the office or home doing honey-dos.
10.5" LMT
I ran about 140 rounds through the gun, a mix of Wolf and Prvi Partizan 55gr FMJ. I had 2 failures to eject with the Wolf, and two failures to eject and a light strike with the PPU. I had issues like this all through the Magpul carbine course I took back in May. After the course, I changed out the extractor spring, insert and O-ring. Now I will be looking at the extractor itself and the ejector spring. I may also experiment with a lighter buffer (I'm currently running a 9mm buffer, which is about as heavy as you can go) to see if more energetic cycling will solve the problem. I fired about as many rounds of .22LR through the gun using my Ciener conversion kit, with zero problems. The new CMMG .22 magazines work great; I will be buying more.
Gemtech MultiMount
I started out with the MultiMount on my Glock 17, shooting regular 115gr FMJ as well as two types of 147gr subsonics. With the subsonic ammo, this combination is pretty quiet from the shooter's standpoint, and very quiet when observed from off to the side. There is a dramatic increase in the noise level shooting 115gr, of course, but it's all downrange (sonic crack). At the gun, the noise level remains comfortable and "hearing safe," and it was still possible to carry on a normal conversation when shooting.
Attaching the can results in a POI shift of about 1.5" low and to the right at 15 yards with subsonics, and about 1/2" with 115gr. According to the manual, you are supposed to be able to pull the can forward about 1/8" and rotate it to different indexing points within the LID mount in order to change POI for various loads, but this did not seem to have any measurable effect.
The thread mount has to be constantly checked and snugged down, or else it will back off a bit after 10 rounds or so. After 4 mags (80 rounds) of continuous firing, the can was too hot to handle, even after doubling up on shooting gloves. I'll be taking a page from bigcraig's book and adding a welding glove to my range bag soon! At that point, I was also getting some serious heat mirage off the top of the can, which made aiming difficult. As a result, my group sizes started to open up. So I put the gun down to let the can cool off before swapping the LID mount out for the 3-lug adapter and moving it over to the 9mm AR.
The MultiMount-equipped 9mm AR shooting subsonics is wicked quiet - to my ear, it's very similar to shooting standard-velocity ammo out of my suppressed .22 pistol. POI shift is also much less than on the Glock (1/2" right at 25 yards with all ammo, and groups were tight), due to the heavier, rigid barrel and more stable mounting interface. This is where the can will spend 95% of its time. We finished up the day blasting clay birds off the berm with this combo... at 100 yards!
The gun is basically shooting within the dot size (4 MOA) at that point, so it took us about 25 rounds to completely dust 4 birds. It was fun. The one thing that surprised me is how much of a thump the gun has when shooting suppressed; you can definitely tell it's cycling harder, but it doesn't really throw your aim off any because it is so fast, and straight back. If I spend a lot of time running the gun with the can on it, I might play around with an extra power recoil spring to soften the blow a bit.BCM w/ Gemtech G5
Doug's gun runs, and runs, and runs. Always has. His setup is a lot heavier than my LMT, though, and the weight of the G5 on the front doesn't help any. It's manageable for outings like this, but I wouldn't want to do a 3-day class with it or anything. Where the gun really starts to shine is running the G5 with the Ciener .22 kit. Almost as quiet as running a dedicated .22 can, and 100% reliable. And today, to our giddy excitement, we discovered that this combo will also cycle subsonics.
I think the staple gun I used to put up the targets made more noise. Seriously. I also got to shoot my Glock 23 and 27, which I haven't had out in months for lack of reasonably priced .40 ammo, and got the iron sights and red dot dialed in on my 10/22, which also ran well.
So we didn't get to shoot quite as much as we would have liked, we got wet, and I don't have any pics to post, but it was still WAY better than a day at the office or home doing honey-dos.
While I'm not in full freakout mode (yet), it would explain this:
