Simply put, the cost in money and time to get the HE M1 up to a reasonable performance level will cost more than the HL M1 coming out soon. they will be here in the near future so save so time , money and energy and wait for it. That is the best advice you will get. Back when all we had for an M1 was the HE alot of people went through some pretty tough work getting them built . It just isn't necessary now unless you just have to take on the challenge. Unfortunately at the moment i dont have access to my old files and photos of what I did and what it takes to get the HE in really good working condition . Then you may think twice.