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HBA Cause 4 K9s is a registered non-profit in the state of Colorado (ID# 20131451644)

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1910 Maxim Reproduction Parts
1910 Maxim Semi Conversion
1919 Internals Machining
Aurora Faux Suppressor
Beretta 38a
Build Components
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CZ-23 / CZ-24 / CZ-25 / CZ-26
Carl Gustaf, Swedish K, Port Said, M/45
FBP (9mm) SMG
FMK-3
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MP-38 and MP-40
PPS-43
PPSH-41 Repair Sections and services
SLS (Semi-only) Sten Long Shroud Kits
Scratch, Dent and Ding Bin
Star Z-45
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Suomi M-31/ KP-31
Tri-pod Adapters
VZ-58 Hybrid 80% (Non-FFL) Receivers
Yugoslavian M-56
ZK-383
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HBA Cause 4 K9s



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HBA Recommends finishes from

The Suomi KP/-31 is regarded by many as one of the most successful submachine guns of World War II and it was so successful that many of its features were later copied by the Soviets in their PPD-40 and PPSh-41 submachine guns. The accuracy compared to the mass-produced PPSh-41 was superior, thanks in part to a noticeably longer barrel, with the same rate of fire and an equally large 71 round drum magazine. The major failing of the Suomi-KP was its high production costs.
Suomi M-31/ KP-31



Suomi M31 80% Receiver AND Lower Siderails - Original ID Suomi M31 80% Receiver AND Lower Siderails - Original ID
Code: m31OID
Price: $245.00
Quantity in Basket: none
 



Suomi M31 80% Receiver AND Lower Siderails - Reduced ID Suomi M31 80% Receiver AND Lower Siderails - Reduced ID
Code: M31RID
Price: $215.00
Quantity in Basket: none
 



Suomi M31 Reweld Jig Suomi M31 Reweld Jig
Code: Suomireweldjig
Price: $130.00
Quantity in Basket: none
 



Suomi Weld-Over Sleeve Suomi Weld-Over Sleeve
Code: Suomiweldover
Price: $140.00
Quantity in Basket: none
 



Remachine origonal Suomi bolt to a Reduced ID Semi auto bolt Remachine origonal Suomi bolt to a Reduced ID Semi auto bolt
Code: Remanm31bolt
Price: $130.00
Quantity in Basket: none
 



Notes for cutting the front flat on the HBA 80% Soumi tube


All ATF/NFA rules apply to purchases made from this site.

 The information/products in these web pages are not intended to be used to construct illegal firearms.

 It is the sole responsibility of the purchaser to know and understand all applicable Federal, State and local laws before placing an order.
By placing any order you are agreeing that you accept all legal responsibility for the products purchased and their subsequent use.

For legal semi auto and dummy gun information, contact BATF at: www.atf.gov

Every reasonable effort has been made to ensure that all photographs, descriptions and specifications on this website are accurate.
However, inadvertent errors may occur, and changes in design or materials, due to our continual effort to improve products, may result in some change in specifications before subsequent publications are issued.
HBA reserves the right to modify or change specifications with or without notice at any given time.

HBA/HBAC4K9s
2008-2016