Avenger bipod mount help!!!

The front part of the stock is a clamshell and separates in the middle. I think it has 4 screws holding it together along with kind of snap and catch devices molded in. The rails is a separate piece that is screwed on and captured between the two sides. If all the screws are tight, there is not much you can easily do to make it more solid. It's plastic. It is not going to get super solid. The screws that secure it are small. I guess you could try replacing the plactic rail with an aluminum one.

I think it is solid enough to hold a bipod. I've shot mine that way many times without any problem. I don't love all the plastic in my Avenger but that is pretty much unavoidable. It is a fun gun that is inexpensive and therefore the amount of plastic has been maximized. I'd put a better barrel and shroud mounting method ahead of the picatinny rail on my list of things to improve.
 
I'd take each half of the forestock and fill the picatinny area with epoxy so that the clamping area will be solid. Then you could pin the two sides together if you want or put a screw in. Epoxy can be thickened with glass spheres until it's like peanut butter or you can purchase Brownell's Acraglas $16.49 that's ready to use.

Don't put the sides back together until the epoxy has fully hardened.

Edit: I just took mine apart and it doesn't work that way. The picatinny part is separate and clamped between the two shells. I don't see an easy way to make it more rigid.
 
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I don't shoot my Avenger much at this point mainly because it is so long. It shoots pretty well but could be better, I suspect, with more work. The shroud mount is plastic. A metal bushing would be better, I think. There is one bushing spacing the shroud out from the barrel about mid-way. I have and recommend an in shroud moderator. With holes in the back of the shroud my noise level is about 85db and I avoided making the gun any longer than it already was. It also positions the front of the barrel.

If I was going to mess with it some more, and I may some day, I would try different barrel to shroud spacers, preferable with O-rings for shroud and barrel contact. If I could find a metal rear shroud mount I'd get that too. Right now you have a barrel supported by a grub screw at the back and a little unimpressive plastic piece in the shroud. Supporting the barrel better with the shroud seems like it would help eliminate fliers. But where they should be located along the barrel length would need to be determined by testing.

I've been mainly shooting my P35s which are lighter and less than 30 inches long. They're bullpups. At the front of their barrel they have a cast aluminum piece screwed onto the barrel and contacting the shroud with an O-ring. The action clamps to the barrel at two points along it's length. The barrel is thus much better supported. My older 25 caliber shoots worse than my 25 Avenger. But my newer 177 and 22 caliber P35s shoot better than my Avenger. I don't think the accuracy difference is all in the barrel support and possibly not at all in the barrel support. But I hunt with my guns and the P35 arrangement seems much more solid for hunting. I think the Avenger is pretty light even for target shooting.
 
Well I know the stock spacer that’s in the middle of barrel to help center I pushed back behind the first band. And I also know from cleaning n pulling my barrel it’s mounted in the breech by three grub screws. I also tighted the shroud mount bushing to the barrel. And having another barrel band at the very front of the shroud. As well as the extended donnyfl adapter with my shogun to finish it off. Now I have seen on eBay harmonic bushing with o rings to place between the barrel and shroud. Weather they work or not not sure but would love to try them. My problem at the moment is the stock I don’t have many flyers most are from my pulling or what not. N that’s pushing 14.3gr about 940
 
I have to agree, the pic rail for the bi pod on the Plastic stock Avenger is Mickey Mouse. Maybe I just got lucky but mine clamps up nice and tight so some tinkering might help. I have had the stock apart several times and the parts do have to go together just right. My bi pod problem was with the actual bi pod and it took some metal filing on it to get it stable. At present this rifle is now as stable off the bench as my other rifles with bi pods so you should be able to improve yours without needing to buy anything aftermarket.