Do any of you AR15 fans out there know how difficult it is to remove the heatshields from the lower half of the handguard? I need to add a piccatinny rail to the lower half and when I removed the handguard I found it has two heat shields pressed onto plastic pins. I need to remove the shields to install the rail and then put the shields back on. Just wondering if it is difficult, impossible, just be careful not to bend, just buy a handguard with rails (epensive), etc. This is a Doublestar AR15 with 16" barrel. The handguard has mounting holes on top and bottom for rails, accessories, etc. Heat shields appear to be spring steel on top of aluminum. Any help would be appreciated. You may PM me if you want. Thanks.