KRG-Bravo Adjustable Bag Rider / 3rd Leg

Description

I designed this 3rd leg because I like it better than a bag when shooting off a bench, but I'm shooting rimfire. No idea how it will be for shooting high power. I designed this for myself - to use. I wasn't thinking of sharing it at the time, so it's maybe a little rough, but somebody asked about it, so I'm posting it. It's not perfect, but it's so good that I haven't tried to make it perfect. I just use it exactly as it is in this version. If I cared enough to reprint some it, to improve it, the main thing I would change is the clearance between the outer leg and the main body. I'd make it tighter. But as it is, when I give the wheel a spin, it really spins, so the leg extends or retracts pretty quickly, which I like. The hardest part of this project was getting the main part to fit the Bravo chassis. And I'll admit it's not quite as good a fit as it could be, but it's good enough to use, after adding one extra screw in the back end. That's what the NUT CARRIER is for, to get the nut in that tight little space at the bottom of the Bravo butt, behind the butt pad. I can't remember whether the rear screw (that I added) was a 4mm, 5mm or 6mm, but the NUT CARRIER is made to fit the nut, so that will help you decide. Sorry I don't feel like taking mine apart to check. Also there's a slot in the NUT CARRIER to allow a screwdriver (or whatever) to be used to position it back in the deep recess No support needed to print the NUT CARRIER, but I did use a little support for the MAIN part, in the slot where the WHEEL goes. I also put a hole in the WHEEL so you can access the front screw to remove the whole assembly without first screwing the OUTER LEG all the way out. The threaded parts were easier. I printed all the threaded parts, INNER LEG, OUTER LEG, FOOT and WHEEL, at 0.07mm layer, to make them work real nice. No supports needed for the foot. And I break-in all the threads except the FOOT with vegetable oil. I wanted the FOOT to be tight on the INNER LEG, and here's why: Originally I made the outer thread on the OUTER LEG pretty coarse, and the inner thread real fine, thinking that that would give me a COARSE adjustment with the WHEEL and also a FINE adjustment by moving the INNER LEG via the knurled FOOT. I even put a slot in the end of the INNER LEG to aid in screwing it in tight on the FOOT. Of course you could always glue it too. But honestly, having used this 3rd leg for about 6 months, out to 200 yds, I've NEVER used the INNER LEG as a fine adjustment. The WHEEL works perfectly, and gives me more than enough resolution, so I might suggest not printing the entire INNER LEG; 1/2" or 1" would be plenty for the shooting I usually do. But having the whole INNER LEG does give more total height adjustment, so you decide. Each of the threaded legs took a long time to print, given the 0.07 layer height I used, fyi. That's all the notes I can think of, but I'll be glad to try to answer other questions if you have em. Good luck.

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