2x m5 by 50mm   cap screws and nuts

optional 2x m5 thumb screws for tool_less removal - eBay item number:*133159181871*

ull need 5mm o.d  rods to buttstock  steel or carbon-fiber

2x wood /plastic screws for endstops for rods on rail side next to red dot 

printing tips --
find a pic rail that you like 
print file - mid rail to butt flex 5mm rod stiffner.stl

print file - less flex butt.stl

join with 5mm rods

rod holes are tight fit, up to you if you want them looser msg back.
-housing is easy fit over rail only needs 1 bolts for .22lr 
-if your hole pattern dosnt quite fit 2x m5 bolts use 40mm m4 in 1 hole  

from https://www.printables.com/model/424793-picatinny-rail-pistol-brace

things to improve on 
-how bulky it is 
-retaining options for removal of rods only - keeping sight

-maybe a peep hole to use iron sites while mount is on red dot back up?

can help with cad work if you like
English or Dutch

moved stock holes so the m5 bolts dont block the rods
move allows you to use thumb screws
instead of bolts for “tool-less” removal of stock & mount,

added test print to find a size/scale with out printing 10hr 
told people hardware / bolt  sizes  overall “user friendly” mods

Printables Tags: ruger; rugermarkiv; reddot; 22lr; stock; picatinnyrail; mrk4