Well the bug bit me and I'm starting another build. This time an ultralight AR in 22lr. I know that there are already prebuilt 22 AR's I could buy, but thats not the point. I'm building outside of my comfort zone in quite a few ways. No 10+ lb varmit rifles, limited budget, iron sights. Only good thing is no time frame. Purely a personal project, no delivery dates.... First off I've bought an ATI Omni gen 3 plastic lower. I know, sacrilege!! But its all right, its getting a plastic upper also and a carbon fiber tension barrel. If anyone has an old carbon 15 upper ill take it off your hands and give it a good home.. The goal is 4lbs or less with a loaded 25 rd mag. Think lightweight plastic fantastic squirrel slayer, easy to carry for these ageing bones this winter, and accurate enough to fill the crockpot with squirrel. All steel parts are going to be stainless for easy cleanup, and extreme weather resistance. Using as many parts as possible out of my parts drawer is an added bonus... Lower below is the ATI omni with a Rock River Arms parts kit in it. No luck on stainless lower parts, so I'll just have to keep it dripping oil. I finished the build last night. Nice thing was, stripped lower $59.80 out the door at my local gun shop, and it came with a 30rd 223 pmag(never have too many)!!! RR lower parts kit was $52.45 after uncle took his cut. Stock, grip and buffer tube assembly are leftovers from my parts drawer. No need for a buffer, just the stock spring. So complete lower $112.25 after taxes. Beat that price if you can!! Weight is(insert weight). (Insert pic) Right now its wearing an old set of magpul MOE OD green furniture. I used this as an excuse to upgrade my carbine and parked the old set here for now. I plan on changing this for something lighter after function testing as MOE is pretty heavy for what I'm after on this build. Maybe ACE skeletal stock, maybe Tacom carbon fiber???.... THE BUILD: I like the little set screws that ATI uses to keep the hammer and trigger pins from rotating in the plastic reciever. Just make sure to get the right screwdriver head so you don't mar them. Would be better if they were hex headed. Nicely machined aluminum insert for the buffer tube support and rear takedown pin, as well as good reinforcements of the stress points. Went together with no problems. Looks like ATI's current gen lower has most of the bugs worked out. The stock trigger is AR rough and milspec heavy(7.8 lbs) but I'll take care of that with a set of 3.5 lbs springs and a little careful stoning. Everything else on the parts kit fit and functioned right from the start. NEXT STEP: Currently I'm planning on a carbon free float tube of some type. Maybe someone else has a few suggestions. I've looked at the taccom small diameter tube but I'm really thinking of a shorter handguard. I'd hate to pay that much just to cut it down. Maybe I'll use a carbon fiber carbine FF tube and add a poly continuous top rail... Taccom's carbon fiber 17" barrel with the threading is the next part to get ordered. It comes with a collar to adapt the 22 conversion kit I got to their barrel at no additional cost. I also need to order the tensioner plug that fits in the buffer tube. http://www.taccom3g.com/site/a9e2c1...fault?url=http://taccom3g.com/ULW_BARREL.html PARTS: I have the Stainless Steel 22lr bolt group on order from PSA. It comes with a brick of 22lr and a 25 rd, gen 2, poly lip, Black Dog mag. Pretty good deal for less than most shops list the conversion alone! $149.99 on sale now... http://palmettostatearmory.com/index.php/22lr-conversion-combo-kit.html Along with the CMMG antijam charging handle for $20.49. According to the research I did this handle has a small slot that prevents a 22 case from getting stuck in the handle and jamming up the works. Cheap insurance... http://palmettostatearmory.com/inde...nti-jam-charging-handle-for-22lr-22ba55a.html Well thats where the project stands right now. More updates as parts come in..... PS sorry bout the long edit. Doing this from my phone out on the road.