Join the #1 community for gun owners of the Northwest
We believe the 2nd Amendment is best defended through grass-roots organization, education, and advocacy centered around individual gun owners. It is our mission to encourage, organize, and support these efforts throughout Oregon, Washington, Idaho, Montana, and Wyoming.
Discuss firearms and all aspects of firearm ownership
Join others in organizing against anti-gun legislation
Find nearby gun shops, ranges, training, and other resources
Discover free outdoor shooting areas
Stay up to date on firearm-related events
Share photos and video with other members
...and much more!
dual
In geometry, every polyhedron is associated with a second dual structure, where the vertices of one correspond to the faces of the other, and the edges between pairs of vertices of one correspond to the edges between pairs of faces of the other. Such dual figures remain combinatorial or abstract polyhedra, but not all can also be constructed as geometric polyhedra. Starting with any given polyhedron, the dual of its dual is the original polyhedron.
Duality preserves the symmetries of a polyhedron. Therefore, for many classes of polyhedra defined by their symmetries, the duals belong to a corresponding symmetry class. For example, the regular polyhedra – the (convex) Platonic solids and (star) Kepler–Poinsot polyhedra – form dual pairs, where the regular tetrahedron is self-dual. The dual of an isogonal polyhedron (one in which any two vertices are equivalent under symmetries of the polyhedron) is an isohedral polyhedron (one in which any two faces are equivalent [...]), and vice versa. The dual of an isotoxal polyhedron (one in which any two edges are equivalent [...]) is also isotoxal.
Duality is closely related to polar reciprocity, a geometric transformation that, when applied to a convex polyhedron, realizes the dual polyhedron as another convex polyhedron.
I bought these new last December 2023. Never used and still in package. 1 - 25+25 in 1 50 round magazine for Rufer 10/22. I heard it also works on Remingtons like Wildcat. If you want to make somebody dance, this is the one. These are extra magazines that I wont need. I might as well pass it on...
Street legal bike. Good shape and runs well. Missing the dash, but the plug in for the harness is there. I switched the front fender to the white one and added the right hand mirror. Some pics show the black front fender and the red spoke covers, which are included. Also included are a brand new...
Rmr dual illuminated RMO8. This is the model that is powered by tritium and does not use batteries. Reticle is an Amber triangle. Sent to Trijicon to replace the tritium in early 2023. Expected tritium lifespan is 12 years but they have a lifetime warranty and will replace as needed. Have...
I have a trijjicon rmr dual illumination with the triangle comes with pic rail mount there is nothing wrong with it just prefer open sights comes with og box and low profile pic rail mount can be used without mount on a pistol with the RMR footprint or use with the rail on a railed pistol or shotgun
I got these batteries to replace my optimas. Mainly for hifi and emergency use. Been into the Noco brand and have a charger and jumper also.
My tacoma has a Stinger isolator. I don't think the configuration is setup for my needs. I want to listen to music with out the truck running. Was told...
my grandsons gaming setup, he upgraded and these are no longer needed. these were working fine when swapped out.
dual HP w2207 monitors with stand
miscellaneous cables and a keyboard
$50 OBO
pickup in Oregon City
no trades, no shipping
going a different direction with a build and offering up a p320 complete 3.6” slide with pmm dual port comp. Slide also had a romeo 1 optic.
Standard 3 dot sights.
Excellent condition 2021 Lifan Xpect Dual sport motorcycle. This is unique in the segment for having EFI instead of a carb. Great beginner bike or second bike for off-road and on road use. The bike has always been garaged since new, and the manufacturer recommended break in procedure was...
There is not a dang thing wrong with this Brand New Toilet , I ordered the wrong one it's the distance from the wall to the discharge opening I have since ordered a new one and Home Depot has changed their return policy to 90days so I can't take it back that time has gone
This white one-piece...
Up for sale I have a US Optics SR-8C with C2Mil reticle, which is a 1-8x FFP scope with a SFP red dot. This means that no matter what magnification you are on you will always have a 2 moa red dot and the hash marks will never change distance relative to magnification. Both the elevation and...