Pistol parts

Pistol parts and handgun parts on one place. Rainier Arms offers you a selection of pistol triggers, barrels, slides, magazines, frames and more from top manufacturers in the industry.

Align Tactical Sig Sauer P320 Offset Extended Magazine Release - Right Hand

4.7 star rating 3 Reviews

$38.00

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Rainier Arms Sig Sauer P320 Fiber Optic Suppressor Height Sight Set - LOGO

4.5 star rating 13 Reviews

$50.00

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Sig Sauer X-RAY3 Day/Night Sights

$99.99

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Sig Sauer P320 OEM Magazine Release

5.0 star rating 4 Reviews

$24.99

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Grayguns Sig Sauer Custom Fat Stainless Steel Guide Rod w/ Spring - P320 X-Five
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Verified Reviewer

0.0 star rating

06/27/25

Review by Anonymous User

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06/27/25

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Christopher G.
Verified Buyer

3.0 star rating

06/26/25

No weight savings

Review by Christopher G. on 26 Jun 2025 review stating No weight savings
I got this as an alternative to a traditional upper with ejection port cover, forward assist, ramp with the hopes that it would be lighter. But putting this on the scale next to an Aero Precision with all the accoutrements attached, this came in at the same weight. So it's great if you're looking for a no-nonsense upper that is sleek and won't get snagged, but less good it you're goal is to shave off an ounce.

On Icarus Precision AR-15 Billet Stripped Upper Receiver

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06/26/25

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Edwin J.
Verified Buyer

5.0 star rating

06/24/25

Best forgrip

Review by Edwin J. on 24 Jun 2025 review stating Best forgrip
High recommended Buy 2

On A3 Industries Aluminum Modular Vertical Foregrip w/ Integrated Hand Stop - M-LOK 2" Smooth Grip

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06/24/25

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Edwin J.
Verified Buyer

5.0 star rating

06/24/25

Happy

Review by Edwin J. on 24 Jun 2025 review stating Happy
100% worth the money , perfect fit and the lower shipped next day will definitely buy again

On Lee Sporting Aluminum MP5 / SP5 / HK Clone Lower Housing - K Push-Pin

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06/24/25

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Casey
Verified Buyer

4.0 star rating

06/24/25

Great large frame AR option

Review by Casey on 24 Jun 2025 review stating Great large frame AR option
The fit and finish on the receiver set is great. I’ve built on seekins, Geissele, and SiCo AR15 receiver sets, but this set is the best fitting. I would’ve given it 5 outta 5 stars, but when I built up the gun I’ve had some annoying issues with Centurion’s hand guard and their Customer Service. They are working to get issues resolved, but there has been multiple issues in a month long resolution. Not a dig on the receiver’s quality or Rainier in getting it shipped to my ffl in a timely fashion because both were solid.

On Centurion Arms MK11 7.62 Ambidextrous Billet Receiver Set - Black

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06/24/25

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RG2
Verified Buyer

5.0 star rating

06/21/25

Staccato CS W/PMM Comp

Review by RG2 on 21 Jun 2025 review stating Staccato CS W/PMM Comp
Sent my CS to Staccato to add a threaded barrel with the intent of adding a comp. Decided on a PMM comp as they had one specifically for the C model. Both the the C and CS are the same at the muzzle but this was listed as not working on a CS due to the shape of the guide rod end as mentioned on another review. As the slide racks the corners of the stock guide rod would make contact with the comp hence not compatible. The DPM System not only fixed this but gave me the opportunity to dial it in. I am very pleased with this set up. It has been great with no issues and is an improvement over stock. The fit and finish are top notch!

On DPM Systems Technologies Mechanical Recoil Reduction System - Staccato CS 3.5″ Bull Barrel

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06/21/25

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$27.00

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Grayguns Sig Sauer Custom Fat Super Black Guide Rod w/ Spring - P320 X-Five

$32.00

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Grayguns Sig Sauer Custom Fat Stainless Steel Guide Rod w/ Spring - P320 Full Size

5.0 star rating 1 Review

$25.00

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Grayguns Sig Sauer P320HY Adjustable Hybrid Trigger

$94.00

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Killer Innovations Sig P320 Base Plate

4.6 star rating 10 Reviews

$30.39 - $30.39

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Killer Innovations Sig P320X Magwell

4.5 star rating 10 Reviews

$75.99 - $75.99

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Grayguns Sig Sauer P320 Adjustable Trigger - Straight

5.0 star rating 3 Reviews

$94.00

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Arc Division FLUX 320 V2 Compensator for Sig P320 - Gold 1/2x28

Special Price $55.92 Regular Price $81.99

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DPM Systems Technologies Mechanical Recoil Reduction System For Sig Sauer P320 Compact & Carry

4.4 star rating 10 Reviews

$88.99

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Rainier Arms Sig Sauer P320 Fiber Optic Sight Set - LOGO

5.0 star rating 1 Review

$50.00

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Tyrant Designs Sig Sauer P320 Trigger

4.0 star rating 2 Reviews

$71.95 - $71.95

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Elite Tactical Systems (ETS) Sig Sauer P320 9mm Magazine - 17rd (5 PACK)

Special Price $49.99 Regular Price $84.95

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