Tag Archives: Colt

Testing the 5.56mm MK318 MOD 0 / 5.56 SOST ammo

The 5.56 SOST  is the ammo currently being used by the USMC and other troops in the GWOT,  it has not been available for the public to buy for very long so I, like a lot of other people have been curious about how it performs. The round was designed to  have better terminal performance and accuracy from short barreled rifles with a muzzle velocity of 2925 fps from the 14.5 inch M4 barrel.  The round is a OTM,  this is important to remember as it is not the same as a hollow point.  It does however, offer up better performance and is barrier blind. The bullet itself has a thick copper base and a lead front end with the usual open tip that results from the process of making the bullet.  Also present are the rings seen around the bullet much like a barnes triple shock X.  A lot of people assumed and still do that the SOST is a barnes solid copper TSX, but it is not.

After getting my hands on some of the ammo I decided to test it for accuracy first. Since the ammo is intended for combat weapons, I chose to use my Colt 6940  with milspec barrel with 1/7 twist. I did put a Leupold 18x target scope on the carbine though so i could get all the accuracy out of it I could.  I fired 2 strings of 5 shots at 1 inch dots and one string of 10 shots of M855 to compare it to the common military load all at 100 yards. It was around 1100 AM , sunny with a  2 oclock 18 MPH wind.

Other then the normal 1st round flyer you usually get from hand cycling the action as opposed to letting the recoil operate and chamber  the next few rounds, the ammo showed some  great potential. The group on the left  was a little worse due to my own bad trigger work and lost concentration on one shot, but still pretty good considering. Now I know some claim  5 shot groups tell nothing, but if you over lay to  strings you get a pretty good idea  and you keep barrel heat down and mirage off the barrel messing with the scope.

After shooting the groups I decided to test out how the round matched the trajectory of the M855 since that is one of the things the SOST round was meant to have in common with the green tip. Out to 300and 400 yards  the SOST did match the BDC of my TA31F  ACOG and zero of other scopes and Aimpoint RDS I had on hand zeroed for the green tip. Also when comparing the position of the groups in relation to the aiming points, you can see on paper that the zero held very close for both rounds.

Now, the real surprise for me, was how good the lot of M855 I shot turned out to be!  Many gun board expurts and gun magazine expurtitions will gladly tell you how terrible green tip is in the accuracy department along with its many other flaws , makes it  slightly more useful then tits on a boar hog. After getting the carbine hot  after some drills using the SOST and playing around, I fired off 10 rounds fairly quickly  with the Colt/18x combo.  The results left me a little surprised, rarely have I seen green tip shot for accuracy  with sand bags, a table and a target scope further then 50 yards. And I do not recall having seen any pictures of it doing as well in a true 100 distance group.  I shot the green tip with all seriousness and the same concentrated effort I did with the SOST and the results were pleasing and a little surprising to me.  I have never taken the green tip seriously  enough for my own needs in the accuracy department so this will indeed lead to more testing of the M855 if for no other reason  then to see if this was a fluke.

Now I do not mean to sound like I think green tip is crap, I have seen some  good performance out of it at longer ranges on coyote size targets and even man sized targets. But on the other hand, I have seen some terrible accuracy from it too. Of course lots and different MGGs have as much to do with it as anything, not to metion the different shoots and the quality or lack of  in the guns used.

Back to the SOST, I think its a pretty good round from what I can tell. It is not MK 262 or TAP 75 gr. But for general issue to everyone, it is an iprovement in my humble opinion.  I have not shot anything living with it yet, but I will. Also, in the next few weeks I will test it though a few “barriers” like auto glass, wood, and wall paneling. Hopefully I will get to shoot through some auto doors as well.  I would not use it in my own house if over shooting is a issue, but I would use it for anything else at this point if you can find enough for SHTF bulk storing. And you have the benefit of practicing/training with M855 and still being able to shoot the SOST without a zero change. At this point I can not say it is better then any MK 262 top load in accuracy, but it is not meant to be, but, it is better then M193 by a long ways and it shows the ability to shoot a lot better the M855 and even if it just matches it in accuracy you still have the benefits of better terminal performance and barrier penetration while still holding together to hit the target behind if power point presentations can be believed. Hopefully my future testing will offer at least a tiny sample to help prove or disprove the new round.

Ranges Notes

Had a Colt 6920 with a Trijicon TA31-MRD ACOG and a Spikes 5.45 with a TA31-ECOS ACOG side by side at the range today.  Both were zeroed using the 300m point of aim at 25 meters.  Later that day, both were used to shoot at a steel target at 565 yards(about 500 meters).  The Colt using M855 ammo and the ACOG calibrated for that ammo was right on for elevation when using the 500m mark.  However when shooting at 500m with the 5.45 and an identical 5.56 Bullet Drop Chart reticle, the 5.45 corresponded to the 400 meter mark on the BDC.

It was interesting to see how much flatter the 5.45 was flying compared to the same zero at the M4.  I’ve never been able to find good data on the ballistic coefficient of the 5.45 7n6 rounds, or readable info on its trajectory.

Colt nostalgia / Black Dog machine QC Fail

Waaaaaay  back before I hit puberty, I made sure the 1st thing I did before I worried about girls was to make sure I had a colt AR15.  Being a college kid later on I was like every other college kid, I was poor. Liking guns plus  being poor equals only one thing.  22 Long rifle.   In an effort to get more out of my AR15 trigger time, I found and quickly bought  this colt .22 conversion kit.

22LR
colt conversion kit

well, not this one, but one just like it.  The first one I had was identical.  I shot it thousands of times and it never failed me.  It was a dream come true for a kid that could not afford new 5.56 ammo and had no way to get surplus ammo. It was easy to put in, take out and needed little cleaning, The only down side was the one 10 rounds mag that came with it.  Later one, once I got older and got a job and a little money, I lost interest in it and sold it off.   Fast forward to a few years ago when ammo prices  skyrocketed.  Conversion kits sprang up every where and became hugely popular again.  This made me remember my humble old colt conversion kit and all the fun I had with it.

After looking around online and spending a little money I managed to get two more of my fun little buddies.  I even got lucky enough to find an extra mag. 30 rounds!!! and I only had to reload 2 times!! But, one was in such good shape I just opened it and made sure it was fine. The other became the work horse for plinking.

new and used
NIB with used

After using the kit for fun I started thinking in terms or using it to train with in place of 556 ammo, and of course in doing so, the 10 round factory mags just would not cut it.  Around the time I started thinking this, a company known for making 25-30 round mags for various conversion kits became known to me. The company is Black Dog Machine. They had a rep for making some pretty good stuff an I wished for a 30 round mag for my ancient colt kits. One day on a gun board they maintain a forum in, the rep posted they would be selling a mag to fit my beloved kit soon. about three years passed before  they actually had something ready. Sadly it was billet aluminum and was 60 bucks a pop. Waaaay to high for me to bother with. i mean 60 bucks a mag? Who would? That is 6 USGI mags. But they did promise a plastic mag that would soon follow. A couple of years later it finally did, and it was priced right so I got on the phone and ordered one.  When it finally arrived, I popped in my kit and loaded the mag. Went outside and went to chamber a round and ….FTF..   tried again..FTFeed again.   I did manage to get  maybe three rounds in a row to fire and cycle but had a lot more problems.  SO after waiting for around three years for this mag, when I got it, it was a complete piece of garbage.

colt kit with working colt mags and garbage BDM mag

I tried to Email the company to see if I could get help. Nothing. After a few emails and phone calls and even IMs on ar15.com  I still have gotten no response from them. I do not know if they do not sell enough to feel the need to service these mags or what, but I was very let down.  Looking at the mag which holds around 25-28 rounds, it has some nice features. It is solid, has steel feed lips, the ability to take spring tension off for easier loading and just feels well made. It however, does little more then look awesome. Now, I have used the BDM in other brand conversion kits and they did fine. But this mag is so out of spec its crazy. The kit is not the problem  because it works with all the factory mags and they are what the BDM tries to copy. The factory mags are built like tanks and are  the very definition of reliable.  Sadly to this day no one at BDM has deemed it, or me worthy of a response to help me fix the mag. I do not want a refund, I want a hi-cap mag for my Colt conversion kit. But I suppose it is not to be, and BDM will have no more of my money.

Now for the kit itself, if you can find them they do not work with the old airforce mags, the ceiner kits or the old military conversion kit mags. They always come with a 10 rounder though since it was intended for plinking and hunting.  You will not get benchrest accuracy out of any conversion kit and a 1/7 twist does less to help, but thats not the point.  However, it is squirrel hunting accurate within 25 yards with a SP-1 or M16 1/12 twist barrel.  Mine have never let me down ( not counting the BDM mag) and have been the 1st rounds fired by my girl friend and younger kids. If you can find one of these fine old Colt kits and the price is right, I highly recommend it. It will be a lot of fun thats cheap to shoot and a nice example of colts past and the early days of the AR15 making its first inroads to the sporting/civilian world.

Lesser known holster that should not be

1911 with surefire light

I would like to start the blog off with a short write up of a small company I found out about a few months ago on a gun board.  The holster was custom made for me by Dark Star gear in PA.   I was looking for a holster that I could mount on a normal belt or a MOLLE type war belt. After looking at all the more common popular options I just was not happy.  I called up the company  and the owner agreed to make a holster for me with my specs.  I asked for  it to fit a Colt rail gun 1911 with surefire X300 light with the FBI cant in coyote tan.

The owner was a great guy, he was careful to make sure he knew and understood exactly what I wanted. This one is the 1st one he has made for the 1911 type and it is just impressive. The holster  oozes craftsmanship and thats hard to do considering the material its made from. The fit of the gun in the holster is snug.  I held the two upside down could not get it to fall out after vigorous shaking.

belt loops for casual belt/riggers or MOLLE

One other thing that really impressed me was  the slight curve of the holster that is so subtle but perfectly conformed to my body. With a button up dress shirt on, i was able to easily conceal the full rig including the wilson  10 round mag. The belt loops can easily be re positioned however you want and  there are extra holes for attaching a knife,maybe a light, whatever..

If you want a very well made nice custom holster that is not made from one of the more popular well known companies that take forever,give Dark star a try. Ican not say he will make anything you dream up, but I am sure he will try to meet your needs. I will say he does NOT make IWB so if thats what you  want you are likely SOL. I will say I was so impressed I have another one on the way.

If you like what you see them a ring at www.DarkStarGear.com  I hope he can meet your need and you can help out a small biz in Pittsburgh,PA and get a  first class piece of gear for your sidearm.