Adds a picatinny rail but it gets loose and wobbly - Luth-AR AR Buttstock Rail

I purchased this item to add a mono pod to the base of my butt stock at first the Picatinny Rall held firm and did a good job but after firing a few rounds out of a 308 Winchester I noticed it started to loosen up and get wobbly no matter how tight a tight in the Picatinny rail it would continue to stay loose and wobbly. It’s looking to add a mono pod via Picatinny rail tier Luther AR NBA one but stock I would not recommend using this product as it does not stay firm and allow your mono pod to stay solid and tie it between the benchrest and your rifle