LooseRounds.com5.56 Timeline


Thank you B&T

I had a little problem with the collapsing brace on my APC9K.

I found that when I shot the pistol with the brace fully collapsed it would jam every single shot.

Every single shot the brass would not eject.

I ended up realizing that the right side bar of the collapsing brace did not have the relief by the ejection port to allow for functioning.

So I got in touch with B&T. Talking to the rep, we figured out that my brace was assembled with the right side bar from the APC556/300 model. They send me a prepaid shipping label and under 2 weeks later I got my brace back with the proper right side bar.

This APC556/300 bar had a groove and two notches which are necessary for the rifle, but lacked the relief that the pistol caliber models need.

The correct right side bar has the relief cut out for operation while collapsed.

Unrelated, I like how the B&T collapsible rig has a notch cut out to interface with a grove in the Tailhook brace. This makes sure that everything is assembled straight and true.

I really appreciate that B&T sorted this out quickly and easily. Unfortunately, my gun still malfunctions about half the time when the brace is collapsed. The brass fails to eject and bounces back into the action causing all sorts of stove pipes, brass over bolt, or similar malfunctions. I have only tried this with cheap underpowered steel cases, maybe better ammo would do this. Still, I am disappointed with these malfunctions.


Arfcom User N_Parker posted a great review on the STRIBOG SP9A1

So I took the plunge into the unknown and purchased a Stribog as soon as they became available. Pending a range report, I am really liking this pistol but I do have a couple of concerns. I am hoping these take-off in popularity making it an attractive platform for aftermarket manufacturers. More specifically the availability of 922r parts should the Stribog prove itself worthy as an SBR candidate.

I contacted Eagle Imports and queried the future availability of stocks and 922r parts and they replied as follows:
“No, we will not be selling stocks or any 922R compliant parts. We will only be selling the basic parts, such as the magazines and adapter”.

Disassembly: Push pins are a little tight, more about that below. Rear cap has a very nice snug fit to the receiver and needs just a light tap with a rubber mallet for removal. Buffer pads at the rear tend to bind a little in the housing so the bolt assembly will not slide out unless you pull on the buffer while pulling back on the charging handle at the same time. I assume a little lube on the perimeter of the buffer pads or at the rear of the housing will fix that.

Upon initial inspection I noticed the front side of the rear sight appeared a little rough then realized after looking at the front sight the ramp or stop had sheared off. I imagine it looked similar to the stop on the front site pictured for reference. I contacted Eagle Imports about this and unfortunately they do not have any parts available yet so they will be sending a new sight when available. Plastic sights that can break are an obvious concern but I plan on taking advantage of the top rail and will be mounting a red dot.

Front Sight

My second concern is lower push pin set-up. At first glance it appeared the rear push pin broke through the housing but what looked like a break is just basically a stepped portion of the lower housing where it meets the upper receiver. This could have been designed better. In the second picture here you can see how the pin breaks that diameter in the housing on both sides. Housing material just above the pin measures 0.082” thick which seems a little thin. Hopefully this holds up and doesn’t wallow out after time. The bright spot here is if the lower does need to be replaced it can as the upper is the serialized/registered portion.

The lower pins have two sets of grooves that engage a wire retainer that simply slips into the housing. These wire retainers apply quite a bit of tension to the pin. I was not able to push the pins out by hand or at least I couldn’t get them to budge by hand. Use of a punch and small dead blow mallet did the trick. It didn’t take much effort to break them loose; it was just a matter of quick tap to get the pin retention groove past the wire retainer. You can also see in these pics that the lower housing is symmetrical in design meaning you can move the retainers to the left side of the lower (installed in right side from factory) if you wish to push the pins out from right to left.



Upper receiver assembly: Very clean machining, fit and finish. Bolt travels the length of the receiver very smoothly. The upper looks similar to the B&T GMH9 and APC9 but the noticeable difference are the screws used to assemble the B&T uppers. Grand Power uses a barrel nut to assemble the upper creating a much cleaner look.


Buffer: Two buffer pads attach via the pins shown here.

Bolt Hold Open/Release
Somewhat of a different design, an ambi bolt hold open/release straddles the outside of the lower receiver and is held in place by the front pin.

Tension spring for BHO

Last round bolt hold open

Trigger Group
As you can see here, the trigger group appears to be a self contained unit that slips into the lower housing. I wanted to remove the trigger group for pics but I couldn’t immediately see how to remove the safety selector. I need to take a closer look at that.

Mag Release

I just purchased the brace adapter and a Gear Head Works Tailhook Mod 2 brace hoping it is compatible with their brace adapter. We’ll find out soon.
Looking forward to taking this to the range and will report out then.

Here it is in it’s current configuration. Shot 147 grain ammo suppressed with no hiccups at all.

Very easy to keep on target. Not as soft shooting as my APC9 or SIG MPX but much smoother/softer than the Scorpion and maybe a little softer than my AR 9mm SBR. I’ll need to run it side by side with my AR 9mm SBR to be sure.

Shot it side by side with my APC9.

25 yard pistol range. Left/first target dialing in the MRO. Target on right second mag. Looks like it could go up and to the right a little more but at that point I just started having fun with it.

Kalashnikov USA KR9 Part II ( Fixed)

You may recall last week the Kalashnikov 9MM AK had some ..issues.

After my friend emailed them and told them what happened. Then they saw my post about it, they were quick to ship out a replacement part.

The gun worked fine today.

I was able to get prone and fire a 15 round group at the target 50 yards away. Ammo was simple Speer Lawmen 147 gr Ball ammo.

So far so good as the guy kept saying as he fell from the 50 story building. I will keep updates going while we ring this gun out over the spring and summer.

Knights Armament (KAC) MP5 RAS source

Knights Armament has made a variety of accessories and firearms that have become rather collectible. One of this is a rail system for the MP5. I was just informed that a store called “Presample Depot” has a four in stock at the time of this posting. Figured I would share that with you in case you are looking for one. I have not ever dealt with this company so I don’t know if they are reputable or not. Good luck.

Link below: