I have a peep on my Lyman GPH and it does help in the accuracy dept. I wear bi-focals and have a hard time seeing the regular open sights. With the peep on the rear and a hooded front site I can shoot about as well as I can with a scope. In fact the best 3 shot group I have ever shot with any gun was with that gun, .28" at 75 yards. Depending on where I hunt this next year I may consider putting a peep on my inline at some point.