The Lyman "kits" are an easy build, assuming you have just a minimal amount of talent and skills. I have both perc .50 and .54. Since I got the .54, the .50 just sits in the safe. I agree with what several others have said - the Lyman GPR is, IMHO, the best commercially made, mass produced muzzleloader available. Go with the .54, you won't regret it . . .