Please send your parts and a copy of your invoice to:
Rainier Arms LLC ATTN: Armorers 4611 E 31st St S Wichita, KS 67210
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If you do not have the tools required to build your upper or disassemble, or would like one of our gunsmiths to handle the build process. The base service will include checking headspace on your barrel and BCG, pinning the gas block to the barrel and test firing the upper to confirm function (will be test fired on you lower if provided or also built at the same time. The accurizing service also includes re-squaring the receiver face to ensure a clean interface with the barrel extension, and bedding the barrel into the upper. You will be contacted with directions for sending your components in as required.
Review by William D. on 21 Oct 2024review stating Flawless
I had my upper Assembly + Accurized by Rainier Arms. I usually build my own but in this instance I was also having a A2 Front Sight post installed on a new barrel in front of a free float hand guard and a flash hider pinned so it just made sense to have Rainier build the entire upper. I don't really trust anyone but myself to work on my firearms b...Read MoreRead more about I had my upper Assembly + Accurized by
ut Rainier did a great job. Not only was it flawless but the turn around time was very fast. I haven't ever have any one else help with one of my builds until now but, If I ever need help again the gunsmiths at Rainier will be the ones to do it! Read LessRead less about I had my upper Assembly + Accurized by
Review by Jeffrey W. on 5 Apr 2024review stating Excellent workmanship
Dear Rainier, I just received my completed upper assembled by your gunsmiths. It was sent to Rainier after a local gunsmith botched the job with the gas block stuck tight halfway on the barrel. I immediately collected everything and sent it to Rainier. I should have sent it to Rainier first. The quality of workmanship is evident throughout. It...Read MoreRead more about Dear Rainier, I just received my
is clean and tight demonstrating the high degree of professionalism at Rainier Arms. Thank you to the gunsmith that assembled my upper and thank you Rainier Arms! Jeff Wood Read LessRead less about Dear Rainier, I just received my
Review by christopher s. on 28 Jul 2022review stating Couldn't be happier
Couldn't have asked for better service. All my questions and emails were answered very thoroughly and in a timely manner. I purchased the A2 sight pinning and upper service with accurizing. The work performed looks great and performs even better than I had hoped. . The hand guard was slightly misaligned but it is the kind that locks around the sta...Read MoreRead more about Couldn't have asked for better
ndard g.i. barrel nut instead of being mechanically locked into a proprietary barrel nut. It was a simple error that was easily fixed and I was more than happy to look past. My initial understanding was that it was going to take at least three weeks for my upper to be completed and returned however I was blown away that less than a week after shipping my parts to them I recieved my new upper assembled and ready to go. The only issue I had with the whole process was shipping my parts. My local ups and fed ex carriers were not helpful at all and ups straight up refused to ship the package. Luckily though my local gun shop assisted me for a small fee. All in all I'm extremely pleased with my experience with Rainier Arms and will definitely be sending a couple more uppers to them for the same services. Read LessRead less about Couldn't have asked for better
Review by William D. on 21 Oct 2024review stating Flawless
I had my upper Assembly + Accurized by Rainier Arms. I usually build my own but in this instance I was also having a A2 Front Sight post installed on a new barrel in front of a free float hand guard and a flash hider pinned so it just made sense to have Rainier build the entire upper. I don't really trust anyone but myself to work on my firearms b...Read MoreRead more about I had my upper Assembly + Accurized by
ut Rainier did a great job. Not only was it flawless but the turn around time was very fast. I haven't ever have any one else help with one of my builds until now but, If I ever need help again the gunsmiths at Rainier will be the ones to do it! Read LessRead less about I had my upper Assembly + Accurized by
Review by Jeffrey W. on 5 Apr 2024review stating Excellent workmanship
Dear Rainier, I just received my completed upper assembled by your gunsmiths. It was sent to Rainier after a local gunsmith botched the job with the gas block stuck tight halfway on the barrel. I immediately collected everything and sent it to Rainier. I should have sent it to Rainier first. The quality of workmanship is evident throughout. It...Read MoreRead more about Dear Rainier, I just received my
is clean and tight demonstrating the high degree of professionalism at Rainier Arms. Thank you to the gunsmith that assembled my upper and thank you Rainier Arms! Jeff Wood Read LessRead less about Dear Rainier, I just received my
Review by christopher s. on 28 Jul 2022review stating Couldn't be happier
Couldn't have asked for better service. All my questions and emails were answered very thoroughly and in a timely manner. I purchased the A2 sight pinning and upper service with accurizing. The work performed looks great and performs even better than I had hoped. . The hand guard was slightly misaligned but it is the kind that locks around the sta...Read MoreRead more about Couldn't have asked for better
ndard g.i. barrel nut instead of being mechanically locked into a proprietary barrel nut. It was a simple error that was easily fixed and I was more than happy to look past. My initial understanding was that it was going to take at least three weeks for my upper to be completed and returned however I was blown away that less than a week after shipping my parts to them I recieved my new upper assembled and ready to go. The only issue I had with the whole process was shipping my parts. My local ups and fed ex carriers were not helpful at all and ups straight up refused to ship the package. Luckily though my local gun shop assisted me for a small fee. All in all I'm extremely pleased with my experience with Rainier Arms and will definitely be sending a couple more uppers to them for the same services. Read LessRead less about Couldn't have asked for better
