STRIBOG LOWER RECEIVER

Additionally, this receiver uses the popular CZ Scorpion magazine instead of the OE Stribog magazine. The improved magwell angle and curved magazine has an inherent advantage over straight mags and has been proven to provide more consistent feeding, as well as better tolerance to various brands/types of ammo. 

 

 

Lower receivers ship complete with new 304 stainless steel Bolt-release lever, A3 Tactical TRI-Lever polymer mag release pre-installed, new bearing detent takedown pins, new 1/4" grip screw, and selector detent with spring. Receiver is manufactured from injection molded Zytel polymer with 30% glass reinforcement. Upgraded aluminum bolt release lever and aluminum mag release optionally available. 

 

A3 TACTICAL BOLT RELEASE LEVERS: -By default, our lower receiver ships with a CNC-formed steel bolt release lever. These are manufactured from 304 stainless steel and powderocated satin black. -This item can be upgraded to our machined aluminum bolt release lever. These levers are machined from 7075 aluminum and then hard coated low-gloss black. They have a hardened steel insert at the bolt interface and textured thumb levers.

 

 

 

PSA 35-ROUND MAGAZINE

Featuring a “PMX” polymer matrix construction the PSA 35 round 9mm series magazines, combine an engineered thermoplastic magazine body with inserted stainless-steel feed-lips. Providing users with improved performance and reliability.

Features:
Impact & chemical resistance engineered thermoplastic body.
Insert molded 17-4SS feed-lips
Anti-tilt self-lubricating follower.
Impact resistant floorplate with and elastomeric strike plate.

Materials:
Magazine body – Custom compounded engineered Nylon
Follower – Delrin
Floorplate – Super tough Nylon
Floorplate lock – Super tough Nylon
Strike-plate – Thermoplastic Elastomer
Feed-lips- 17-4 Stainless Steel

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MAGAZINE INFO and COMPATIBILITY:

The biggest issue with Scorpion magazines in a Stribog is the Stribog's sensitivity to mag position, angle, and movement. When designing the lower, we tested various magwell angles until we found the angle that fed the most consistently. Mag height actually is even more important for feeding properly. On the Scorpion the ejector is higher (than the Stribog) and the base of the bolt has more clearance for the magazine. Everything is very forgiving on the Scorpion which is why they run so well with all of the different magazine options, even though the magazine dimensions vary drastically. 

In the image to the right, you can see the varying differences between 3 brands of magazines. The feed lips all have different heights, and the taller ones can interfere with the Stribog ejector.  Ideally you want your magazine butted right up against the ejector, but not binding or dragging on the bolt. If you have to smack the magazine for the mag catch to seat you will have feed issues. The only way to guarantee ideal fit is to file the top of the feed lips until they fit this way. The Magpuls have the tallest feed lips and, while they may be the best Scorpion magazine, they are the most prone to have issues unless they are filed.

Below is a chart of Scorpion magazines with the PROS and CONS of each:

BRAND/STYLE	PROS	CONS
MAGPUL 35 ROUND	Low price High quality Good fit in magwell	Tallest feed lips usually requires filing to fit and function properly
ETS 40 ROUND	Highest capacity Good fit in magwell	Generally will not feed last 1 or 2 rounds when used in the Stribog
PSA 35 ROUND	Low price High quality Good fit in magwell	None
MANTICORE 32 ROUND	Steel feed lips Low price Good fit in magwell	None
CZ FACTORY MAGS	Low price	Loose fit in magwell Hit or miss functionality due to various changes throughout the years
MAGPUL, F5, PROMAG 50 ROUND DRUMS	None	Not compatible