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View Full Version : Adding LRBHO Arsenal Circle 10 AK magazines


beanz2
10-07-2012, 9:50 PM
Credits go to stargazer111 from arf.com (http://www.ar15.com/content/page.html?id=665)

Two weeks ago I and my brother took the 4 Day Practical Rifle Class at Front Sight. I brought my Fuller AK47 and he brought his Bushmaster Carbon 15. FS instructors make us AK guys do a malfunction 1 clearance first when our triggers go click and the gun does not fire before we can change the magazine. They reason that in the AK, as the bolt stays closed after the last round unlike in the AR, one cannot really be sure if the magazine is empty or it just fails to load a round into the chamber. So for emergency reload exercises, we AK guys tend to fall way behind the AR guys.

I decided when I go back next month that I will have a last round bolt hold open feature in my AK. The Saiga that the Fuller RD107 was based on used to have LRBHO, but Jim doesn't like this feature (I'm sure for good reasons) and all of his Saiga-based production rifles have their LRBHO removed.

So this evening I decided to add LRBHO to my Circle 10 magazines. Either I can learn to take my firing hand off the grip and get used to latching the charging handle into the Krebs safety, or just let the bolt slam shut as the empty magazine is removed and charge the AK normally after a fresh magazine is inserted.

On to pictures.

The Yugo LRBHO magazine has a prominent hump on the follower that stops the bolt from closing after the last round. In addition, the follower can go all the way to the top of the magazine feed lips. The other magazines I have seen also have this hump, but its rear portion is rounded that allows the bolt to push the follower down, even if the follower goes all the way to the feed lips. The follower on the Arsenal/K-Var/Bulgarian Circle 10s don't:
http://www.calguns.net/calgunforum/attachment.php?attachmentid=173133&stc=1&d=1349673779

http://www.calguns.net/calgunforum/attachment.php?attachmentid=173135&stc=1&d=1349674523

Enter Falcon Arms magazine follower (http://www.falconarms.com/ak-47-1/ak-47-magazine-follower). They do not advertise it as a LRBHO follower, not sure why...
http://www.calguns.net/calgunforum/attachment.php?attachmentid=173134&stc=1&d=1349674256

These followers go into the Circle magazine body well, but they cannot go all the way to the feed lips as they are made to clear the follower stops for the usual milsurp steel magazine. So, some clearancing is necessary:

I found that I needed to remove about 5 mm of metal below the top follower shelf (as indicated by the blue tape) on the right side.
http://www.calguns.net/calgunforum/attachment.php?attachmentid=173136&stc=1&d=1349674883

And about 9 mm on the left side as the shelf is higher on the left.
http://www.calguns.net/calgunforum/attachment.php?attachmentid=173142&stc=1&d=1349675188

beanz2
10-07-2012, 9:59 PM
I used the cutting disc attachment on the Dremel (sorry for the blurry pic, it was hard holding the camera with my right hand and a running Dremel with my left
http://www.calguns.net/calgunforum/attachment.php?attachmentid=173143&stc=1&d=1349675453

I filed the sharp edges and park'ed the bare metal with Birchwood Casey's Perma Blue
http://www.calguns.net/calgunforum/attachment.php?attachmentid=173144&stc=1&d=1349675533

Decent results for a total amateur LOL
http://www.calguns.net/calgunforum/attachment.php?attachmentid=173145&stc=1&d=1349675690

Cutting the followers at first seem to weaken the front lip structure, but since the follower lip actually rides on the magazine spring, it is supported quite well:
http://www.calguns.net/calgunforum/attachment.php?attachmentid=173146&stc=1&d=1349675817

This is the end result, now the follower goes all the way up into the feed lips.
http://www.calguns.net/calgunforum/attachment.php?attachmentid=173147&stc=1&d=1349675933

beanz2
10-07-2012, 10:06 PM
How well does it work? Well, I don't know :shrug: By this time all the ranges are closed and all I can do is cycle the charging handle with snap caps in the magazines. Seems to work fine ...

http://www.calguns.net/calgunforum/attachment.php?attachmentid=173153&stc=1&d=1349676348