I was asked to try one of these when they first came out and did but I think because all my rifles at the time were shooters and it didn't help any.I took it back the next day but wished I had kept it untill I shot a rifle that wouldn't shoot to try it.But after talking to the fellow at sims I think it would help if you had a rifle that wouldn't shoot.I just didn't spend enough time on it.
AS BTM said the critters aren't going to care what the rifle looks like and $20 bucks is cheaper than buying a new rifle.