Oh yeah, you can get a parts kit or a part for every thing on an AR. and if you look real hard you can find AR parts in ditches on the side of the road. :ROFLMAO:
Just a note on KCI drums, i sent them an e mail telling them it wouldn't work and they sent one back the next morning asking for my address so they could send me a prepaid label to ship it back. got the label printed and ready to take it to Fedx in the morning. now that's good customer service...
The front one has a set screw or even a screw that goes through that one side and into the guard. some even have push pin that fits into the guard that you push in to pop it in the lower.