Depends on what you call effective. Peep sights on my M1 will take out a man sized target at 1000 yds with ease, group into 6" dia. at 1000, no. And my M1 is an H&R made in the last group ever made and is very accurate, a winner when I shot hi-power. Peep sights are definately a cut above open sights as iron sights go and single shot rifle match scores with peep sights are unbelievable. Once a rifle is set up with iron sights I wouldnt swap barrels but it can be done by marking the barrel and reciever and returning the barrel to the match mark. You may have to rezero the sights. Headspace should be OK and can be checked.
El Lobo
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