It’s like people forgot the fight over DeCSS back in the ’90s:

a=1.59;b=5.93;c=10.68;d=13;e=18.67;f=20.26;$fn=64;module c(r,x,y){translate([x,y])circle(
r);}module s(h,w,x,y){translate([x,y])square([h,w]);}module e(h,x,y){rotate([x,y])linear_
extrude(h){children();}}module P(j,k){polygon([for(i=[j:k])[X[i],Y[i]]]);}X=[0,0,2.76,3.5
6,3.56,4.35,14.7,15.5,15.5,23-b,23.9,24.34,28.5,29.12,33.95,35.1,39.9,39.3,37,f,37,37,36,
34,26.5,18.46,e,f,f];Y=[0,d,d,12.3,4,3.2,3.2,4,c,13.43,17.37,38-f,22.7,23,23,28-b,1.75,.8
,.25,0,0,.25,.84,9.46,14.2,12.5,8.6,7,0];difference(){e(12.44){difference(){union(){P(0,1
9);c(a*2,e,c);}c(a,23.12,18.75);c(2,18.9,10.56);c(6.35,27.82,8);P(20,28);}c(a,e,7);}e(23,
-90,0){difference(){s(22.43,d,0,-d);hull(){s(1,1,22,0);c(b,5.3,-6.5);c(b,5.3,-5.81);c(b,1
7.46,-6.64);}}c(.79,23.1,-21+c);s(a,2.68,22.3,-d);}translate([23.1,0])e(e,0,90)hull(){s(1
,1,-d,19.24);s(a*2,1,-12.7,0);c(a,-11.11,18.65);}}

Whatever you do, don’t paste the code block above into OpenSCAD and render it into an STL. Whatever you do, do not load that STL into a slicer. Whatever you do, don’t send that sliced STL to your 3D printer. Above all else, don’t pull the resulting object off of your printer and drop it into an AR-pattern modern sporting rifle.

:-)

(Code swiped from here.)