Cheap upgrade for m-lok handguards - Guntec USA M-Lok Rubber Insert Covers

This is the fourth time I bought this product (first time from Optics Planet). I've used them on several AR-15 M-LOK handguards. I usually don't like unnecessary rails and additions to handguards - I like to keep things light and simple (with the exception of a fixed front sight and a sling mount). However, these little insert covers from Guntec don't stick, don't add any noticeable weight, and make the handguard "grippier". Being "grippy" can be good or bad (for example, grippy handguards can get hung up on cloth, etc) depending on personal preference. So beware that this product may not be for you. But at this price, if you are on the fence, it couldn't hurt to try it. Also beware that these little guys may be a little difficult to insert at first, and if you don't do it right they may pop out. You can just stick them back in, they're tough, and difficult to damage if you install incorrectly. Best of all, if you don't like them for any reason, you can take them out anytime - it's not a permanent alteration. Long review for a cheap little item.