Ugh. That Pelican sniper rifle is one of the worst light guns I've ever played with. Just to use it with Silent Scope, you gotta turn the brightness on the tv WAAAAAY up to the point where everything on screen is too washed out so it'll register. Even then, it's still very flaky.
It's pretty fun to use in Hose Of The Dead III in shotgun mode, but the thing was so damn heavy, I had to rest every 5 minutes to keep my arm from falling off.