I got mine from the saiga12 forum and it works great. I admit, the lever arm is a little on the delicate side, but after 500 rounds it is still going strong. Although you can load from a closed bolt, it is a lot easier to pop the mag in and charge it with the lrbho. Oh, and did I mention that it was way cooler with it than without it?
Yes, shave the front lip, test fit, and repeat. Try to keep as much of the little raised plastic bands on agp mags as you can as they will decrease mag wobble.
docwade... Could you post a close-up pic of your LRBHO?
I'll dig around. I think I might have a spare LRBHO setup.
You can use the slot for your manual bho. You have to dremel an opening in the center support. Then modify the magazine on the right and superglue a supplied stainless trip shim on the follower. I don't think they are being made anymore though. But I do have one spare available.
Those were sold about a year or two ago by someone on the Saiga-12 forum. The reason why it is no longer sold is that it did not work so well. I think the person's name on Saiga-12 was Jeric. Anyways the LRBHO is a sore and tired subject on that forum. There has been much anticipation of a new one that would work more reliably.
For those desperate enough to have one, I believe there is a Russian option using the Russian magwell and Russian mags. Of course this can be pricey and difficult because its coming from so far away.
Another is to wait for MSA to come out with their magwell solution to the S12 which is also expected to be released later this year. There is another vendor on Saiga-12, Cobra's Customs, who is working on a LRBHO solution with plans also to release later this year.
If you asked me, I would just wait it out until the parts are available at Carolina Shooters Supply. Greg only offers parts that have been tried and tested to really work for its intended application. He also won't post products for sale until he's guaranteed its availability to the market so he doesn't jerk you around on some indefinite wait like some other vendors out there. If it is on Greg's site, its available, it works and its offerred at the best price with very reasonable and fast shipping.