The OTs-126 is a Russian PDW developed from the PP-2000 platform as a civilian hunting carbine. The OTs-126 is also fairly new as it was first seen in 2017.
The Modify Ots-126 GBBR features a 460mm inner barrel, X-range hop up bucking and a LOT more picatinny rail space. The kit also includes a M4 style buffer tube and an adjustable stock. Making it an overall more accurate platform compare to its PP-2K counterpart. With its longer barrel, it will also achieve higher FPS compare to the PP-2K. Also, the handguard on the Ots-126 wraps around the charging handle, unlike the PP-2K, now you can grip gun without worrying about stopping the bolt from reciprocating.
Internally the Ots-126 and the PP-2K are the same, and will take the same parts, so if you already have a PP-2K lying around, you will not have to worry about magazine and parts compatibility.
*Special Note*
By design, the nozzle in the action is blocked by the magazine follower, with the bolt group at the half-way point of the ejection outlet. Removing the magazine the bolt group will automatically push forward to cover the ejection outlet.
*Ots-126/PP-2000 How to debug a malfunctioning action*
Check out Marck's review on the PP-2000:
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Magazine Compatibility:
Includes: