FFL Required Before Shipping. Please have your dealer email a copy of their FFL to FFL@rainierarms.com or fax it to 253-218-2998, referencing your name and order number.
Machined to the Tightest of tolerances on 5 axis Aerospace machines. Designed to provide a more Rigid shooting platform than other Receivers while still saving as much weight as possible.
Features:
100% Billet aluminum machined for tightest tolerances and longevity.
Designed to provide a more ridged shooting platform than other ar9 receivers on the market while saving as much weight as possible
Standard features include ejector with supplied set screws
Lower receiver last round bolt hold open (lrbho)
6/32 stainless steel bolt catch set screw
Custom checkering
No forward assist
Full m4 picatinny rail
Flared solid magwell that accepts all Glock style magazines
Anodized Aluminum Magazine catch and enhanced spring included.
9mm Carbine buffer (5.6 oz),carbine spring and 9mm buffer spring spacer recommended for optimum performance.
9mm lower Receiver works best with the Jacob Grey 9mm Upper receiver.
Weight: 1 lb 4.8 oz
Please NOTE: Magazine Release and Last Round Bolt Hold Open does not come installed
Review by James on 30 Jan 2025review stating Perfect for AR9 build!
Everything fits great and perfect tolerances. Got two sets and both sets worked flawlessly. Both receiver sets worked with two different drop in triggers and no problem with fitment! Will consider another one for 8" build! Also can't go wrong with the $299 price point!
Review by Tyler B. on 26 May 2023review stating Meh...
Machining is great....customer service from JG is horrid. I have 3 different LPK's....most of the pieces won't work on this set. I have purchased 2 different AR9 drop in trigger's, neither one of them fit the lower. It's been a nightmare. I have reached out to JG and I was told to just take a Dremel to the trigger opening to make the drop in fit. ...Read MoreRead more about Machining is great....customer service
I asked if one of their gun smiths could meet me for lunch (I live less than 5 minutes from their facility) and was told they don't do that because it's a security issue. I'm like, take a look at this, something isn't right....nope, all they offered were to send me the correct set screws. Find something else is my opinion. Read LessRead less about Machining is great....customer service
Review by Gary J. on 21 Dec 2021review stating Great Set
This is a very well machined set, the upper and lower fit together with near-zero wiggle/rattle. There are no roll pins to install but rather threaded studs so assembly of the mag catch and bolt release are very simple. I would have removed a start for the following reasons but Jacob Grey's customer service was great so they earned it back. ...Read MoreRead more about This is a very well machined set, the
1) No instructions on how the LRBHO went together. I emailed JG and within a day they sent me a video on how to assemble it. 2) Missing mag catch spring. I again emailed them and (thru some holiday setbacks and mail delivery issues) they sent me out the missing spring. Very responsive the whole time.
Overall I'd buy from JG again. Read LessRead less about This is a very well machined set, the
Review by Charles B. on 5 May 2021review stating I like it, but....
Stellar styleing. Superb machining. Mag well tight for Glock branded magazines. BHO feature has to be adjusted to work. Lower does not work well with all bolt catches. For the price, I’ll wait for Jacob Grey Gen 2 model.
Review by James on 30 Jan 2025review stating Perfect for AR9 build!
Everything fits great and perfect tolerances. Got two sets and both sets worked flawlessly. Both receiver sets worked with two different drop in triggers and no problem with fitment! Will consider another one for 8" build! Also can't go wrong with the $299 price point!
Review by Tyler B. on 26 May 2023review stating Meh...
Machining is great....customer service from JG is horrid. I have 3 different LPK's....most of the pieces won't work on this set. I have purchased 2 different AR9 drop in trigger's, neither one of them fit the lower. It's been a nightmare. I have reached out to JG and I was told to just take a Dremel to the trigger opening to make the drop in fit. ...Read MoreRead more about Machining is great....customer service
I asked if one of their gun smiths could meet me for lunch (I live less than 5 minutes from their facility) and was told they don't do that because it's a security issue. I'm like, take a look at this, something isn't right....nope, all they offered were to send me the correct set screws. Find something else is my opinion. Read LessRead less about Machining is great....customer service
Review by Gary J. on 21 Dec 2021review stating Great Set
This is a very well machined set, the upper and lower fit together with near-zero wiggle/rattle. There are no roll pins to install but rather threaded studs so assembly of the mag catch and bolt release are very simple. I would have removed a start for the following reasons but Jacob Grey's customer service was great so they earned it back. ...Read MoreRead more about This is a very well machined set, the
1) No instructions on how the LRBHO went together. I emailed JG and within a day they sent me a video on how to assemble it. 2) Missing mag catch spring. I again emailed them and (thru some holiday setbacks and mail delivery issues) they sent me out the missing spring. Very responsive the whole time.
Overall I'd buy from JG again. Read LessRead less about This is a very well machined set, the
Review by Charles B. on 5 May 2021review stating I like it, but....
Stellar styleing. Superb machining. Mag well tight for Glock branded magazines. BHO feature has to be adjusted to work. Lower does not work well with all bolt catches. For the price, I’ll wait for Jacob Grey Gen 2 model.