Just added some Williams peep sights to the marlin 336c. If anybody is considering them go ahead and pull the trigger. Supper easy install. Took about 10 rounds I was zeroed.
Front sights is a Williams fire sight. They come as a set. I was able to get half inch groups at 50 yds. It opened up to about three inch groups at 100 yds.
Williams Peeps I put that same rear peep on my Marlin 375 but with a 1/16" Gold bead up front. Ended up putting the same set-up on my 94 Winny in 30-30 (albeit side receiver mount). Groups are about the same as yours, and great for thick woods hunting !