Poor instructions and design - Tps Arms Ar-15 Enhanced Trigger Guard Billet Aluminum

trying to install TPS arms lower kit, very poor instruction on the correct way to install forward trigger guard pin. if you install it with the parts supplied you will damage your lower if you had to remove. no instruction on web or from the manf web site. from what i am able to determine after 3 hours searching internet when the front pin is installed to remove it would require a gun smith or you leave installed for ever.