I just tried to post a reply regarding your Botach KZ forearm but it got headed off for delayed posting because it had a link in it. Anyway..... You should be fairly happy with your KZ.
I just recieved mine (KZ) yesterday, I installed it with no issues and I think it looks great. If anything, the barrel slides a little harder when disassembling and reassembling.
I used to have one but sold it because I was looking for something at the time that would allow me to keep my Sidearmor rail system so I ended up with a Surefire M80. I reviewed the KZ when I first got it ( the dreaded link I tried to post ) Just put in "KZ forearm review" in the search box at the top of the page and it will bring it right up (pictures start on page 3) I've often thought about getting another KZ to try out some other light mounting options I've had in mind. Are you going to be mounting a light?
So I just read your forearm review and it is pretty detailed. At the time I ordered the KZ, I wasnt even aware that there was even another option for the M4. I am going to have to Google "Surefire" to see what it looks like, unless you have more pics. Sounds like I could of made a bad choice. But the KZ IMO is really cool. Now I have to order the extention.
Flashlight yes.... I have an AR15 with a 4 rail handguard, I already have many attachments such as a VLTOR quick release flashlight attachment w/Surefire flashlight, also VLTOR vertical grip attached as well. It looks very cool with these attachments. I still need to purchace the rail covers as it is uncomfortable to handle.
As far as compliance....No you don't need to write to the ATF about anything. Several of us (including me) did write them for clarification of the law as it relates to the M4. Again I don't want to send another post to limbo by posting a link so I'll just suggest putting "ATF letter response" in the search box to find the thread started by MeanGreen that will show you the responses we received and some healthy debate on the subject.
Sounds like I need to keep all documents as proof locked up in my safe just to cover my butt. This "KZ" rail says "Made in USA". Probably will print Web Page as well. I havent read your ATF letter responce yet, but will do so. Is there anything else I should be aware of?? I still plan on buying the CC Tube. Did you have a hard time getting your old tube off?? Approximately how long did you have to apply heat before you actually were able to turn the old tube off?? I want to be able to interchange the 5 and 7 rd tubes so I will be able to use this gun for deer hunting. We cant hunt with 7 rds. I am not going to use locktite to reinstall. I hope this thing shoots slugs....LOL
As I recall, I waited about 8 weeks on my CC tube......Totally worth the wait!!!!
Thanks again for your detailed responces. I know I am getting good advice from a guy thats been there. What state do you live in?? Are you a big gun collector??