I have the sig p226 E2 40 cal. and I was looking to buy a holster from alien gear. They have two holster options: p226 or p226R (rail). I didn't know which holster would fit my gun the best since I have the p226 E2 and it came with the rail. I feel like I'm making this too difficult. Sig p226 comes with the rail (just looked on their website) so why would alien gear have the two options? Unless the rail holster is fit for a larger or different rail than the standard rail the p226 comes with?