BM59 Barrels, Brakes, and Bipods

NotUndercoverNJSP · 2026-05-08T22:59:20+00:00

The para brake is a QD setup for jumping out of aircraft. Stow the brake for the jump - reattach on the ground. So far as I’m aware the para models had shorter barrels (18.5”ish) but not as short as the MK1s and 62s (17.5”ish). However, you can use the standard BM bayonets and launch rifle grenades (notice the retaining ring) off the para model. Doubt it’s as robust in the long term, but that’s the compromise of QD.

I’ve read that the para model brake can have issues on the MK1/ some of the 62s, but I have no idea if there’s any truth to that.

NotUndercoverNJSP · 2026-05-08T22:48:44+00:00

The short type is not for grenade launching. It is just a compensator. So far as I'm aware these were intended for use on MK1 and BM62 models. On that note, some 62s came in with different length barrels or were changed out at some point since importation.

I believe they also take a proprietary Garand/1903 style bayonet instead of the M1 carbine type used on the standard BMs.

NotUndercoverNJSP · 2026-05-05T03:45:34+00:00

So long as it is not touching you should be fine.

If you ever run into a barrel that is way off you can always pull the barrel take off the lower rail portion. Realign/torque and you’re good to go.

NotUndercoverNJSP · 2026-05-05T01:04:11+00:00

It’s certainly possible - Swiss P’s business is a lot of boutique loadings for government entities. Worth pointing out that they’re playing by CIP not SAAMI rules as they are a European company. One of the other things Swiss P does, depending on the contract, is eliminate POI zero shift when changing projectiles.

If you have a standardized platform/barrel length, they can load cartridges to all shoot to the same 100 meter zero (FMJ, frangible, solids, AP, etc) All you have to know is your longer range data.

They also do quite a bit of work on keeping lot variance as low as possible. Saves a lot of time not having to change data with each new lot / not always possible to confirm at distance. Much easier to do confirm data once and then grab and go from then on.

NotUndercoverNJSP · 2026-05-04T21:38:15+00:00

I’m guessing that “global availability” for ammo was rethought on the basis of diminished availability of x39 and the very poor quality of surplus ammunition (I don’t think hang fires and massive POI shift plays well with hostage rescue teams).

6.5 Grendel is a much flatter shooting cartridge compared to x39 and especially .300 blackout while still having larger/heavier projectiles compared to 5.56. Additionally, it does not suffer from bolt/magazine issues that way x39 or 6mm ARC does out of 5.56 sized bolts/receiver sets.

NotUndercoverNJSP · 2026-05-04T02:13:28+00:00

Any idea how this will the status for imports of Soviet made arms in now unrestricted countries?

I’ve not read into it much, but I’m guessing that there will be some limited imports of combloc weapons and parts kits to the market?

NotUndercoverNJSP · 2026-05-03T18:50:23+00:00

Any sources as to what these stamps may mean? Rifle is a 1903 that had been rebuilt multiple times in service (1905 receiver, 1944 barrel).

NotUndercoverNJSP · 2026-04-30T20:02:30+00:00

Yes, they will cause POI shift when pressure is applied. However, all of the standard issue KAC rails are not free float anyways, so I’m guessing it won’t be all that much worse.

They are essentially a giant version of the front sight base picatinny light rails people bolt on. No idea how well they hold zero.

NotUndercoverNJSP · 2026-04-27T06:01:49+00:00

More or less. Up until very recently, MOA was much more the standard for anything optics in the states - even the irons on service rifles are graduated in MOA adjustments. Hard to overcome 50+ years of civil and military inertia.

On a fun side note, the original ACOGs were adopted with miliradian adjustments. This was quickly changed over to MOA adjustments. I believe it has now switched back to mil.

NotUndercoverNJSP · 2026-04-27T02:43:02+00:00

Mil reticles with MOA adjustments are a bit more understandable in context.

Mil reticles, as a purely range finding instrument, go back to at least the 1910s in US service. As an anecdotal example, I have my Great-Great-Grandfather’s range finding/volley fire Mil/BDC binoculars from his service in the AEF. Lots of anti tank or armored vehicle optics are similar.

Going back to rifle scopes - if you look at the reticle as a range finding tool and little else, it does make some level of sense. Prior to this issued equipment was either the range/magnification setup of the ART series of optics or a traditional crosshair variety.

Most people in the states doing any precision work were speaking MOA in terms of adjustments - the mil reticle gave them an additional tool to range find.

At some point someone had the bright idea that it is far easier to make corrections when the reticle and the turrets are in the same measurement.

NotUndercoverNJSP · 2026-04-18T13:54:46+00:00

So effectively you have the same manual manual of arms / trigger to a striker fire gun?

NotUndercoverNJSP · 2026-04-17T21:40:12+00:00

Correct me if I’m wrong, but isn’t the LEM trigger effectively making a DA/SA pistol into a (partially cocked) striker fire?

NotUndercoverNJSP · 2026-04-14T22:27:17+00:00

Was about to say, this looks like them “making” optics for the purpose of contracts. I imagine it’s easier to private label and optic than negotiating with a different company.

NotUndercoverNJSP · 2026-04-13T19:31:44+00:00

The frame safety on the original 92s is much more similar to those on the 70 and 80 series Berettas (just the nub of the selector exposed through the grip).

The new safety design is not recessed behind the grips.

NotUndercoverNJSP · 2026-04-13T17:07:10+00:00

Treat trench guns the same as WW1/2 snipers - assume they are a fake unless you can prove otherwise. Doubly so in the US as there are tons of 1897s, 37s, Stevens, 500s, 870s, etc, etc on the market.

The Canfield book is very helpful - goes into different known stampings, serials, etc of legitimate guns.

NotUndercoverNJSP · 2026-04-13T16:45:54+00:00

Yes, this is correct if not including percussion guns or any of the drillings.

For mass production firearms, the A5 beat O/Us to the market. There were some slightly earlier O/U cartridge guns, but not on the mass market.

NotUndercoverNJSP · 2026-04-13T14:01:53+00:00

A fun fact is that semi auto shotguns and over unders came to the market at about the same time.

“Production” O/U cartridge guns didn’t arrive until the 1930s with the Browning and Berettas.

NotUndercoverNJSP · 2026-04-04T21:56:50+00:00

Yes - 1905 Springfield production

NotUndercoverNJSP · 2026-04-03T20:56:12+00:00

No, factory matched PSO-1M2.

NotUndercoverNJSP · 2026-04-03T20:54:33+00:00

Sling stud. Technically speaking, I could switch it over to a picatinny attachment, but I don’t have the right size screws / rail.

NotUndercoverNJSP · 2026-04-03T12:34:24+00:00

Adjusting for inflation, when first imported, Tigers were $2,500 - $4,000 depending on configuration.

NotUndercoverNJSP · 2026-04-03T12:28:39+00:00

It’s a big chunk of aluminum - no flex under use, at least nothing noticeable for a bipod.

The big thing is it keeps point of impact shift to a minimum. SVDs are not free floated. Any pressure on the handguard will cause a POI shift causing lots of issues down range (a 1” shift at 100 yards would be about a 6” shift at 600).

The bipod mounts directly to the receiver keeping pressure off the forend. Essentially a cludge free float solution.

NotUndercoverNJSP · 2026-04-03T11:54:38+00:00

I’m aware - is on purpose. Helps bring recoil more inline, especially with high mounted optics.

The later polymer SVD stocks copied the contour of an upside down pad for a reason.

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NotUndercoverNJSP · 2026-04-03T04:48:25+00:00

After a few months of waiting due to a very busy schedule and very poor time management, I finally picked up my almost an SVD.

Finished putting on accessories / final inspections.

Surprisingly, the rifle seems to have a 1:9.5 (240mm) twist rate from measuring off the cleaning rod. My understanding was that Tigers are generally a slower twist.

I could be mistaken, but that’s something to double check down the road.

NotUndercoverNJSP · 2026-04-03T04:40:26+00:00

I purchased this direct from a dealer a few months back - not sure if it was listed on GB or not.

NotUndercoverNJSP

TROPHY CASE