Sig Sauer Ammuniton 

Sig Sauer MCX Rattler 300BLK PSB Pistol Carbon Steel

Rating(s) starstarstarstarstar55 (1)1   View all Ratings
Write A Review
Product SKU # :TSPMCX-300B-5B-TAP-PSB |  MPN: PMCX-300B-5B-TAP-PSB  | UPC # :798681581306
Sig Sauer MCX Rattler 300BLK PSB Pistol Carbon Steel
Free Shipping!
out of stock
login to signup for Back in Stock alerts.
PLEASE NOTE: It is your responsibility to be familiar with your current local gun laws BEFORE placing your order. Please feel free to contact your chosen dealer to verify any questions or concerns regarding specific firearms.

Customers Also Bought

  • Details
  • Shipping

Sig Sauer MCX Rattler 300BLK PSB Pistol Carbon Steel - PMCX-300B-5B-TAP-PSB

Sig Sauer MCX Rattler 300BLK PSB Pistol Carbon Steel for sale online at cheap discount prices with free shipping available on semi-auto rifles only at our online store Target Sports USA carries the entire line of Sig Sauer for sale online with free shipping on firearms including this Sig Sauer MCX Rattler 300BLK PSB Pistol Carbon Steel.

Sig Sauer Elite M400 5.56 NATO Semi-Auto 30 Rounds 16” Barrel Black review offers the following information; The MCX Rattler PSB is a semi-auto pistol variant of Sig Sauer’s select-fire MCX Rattler SBR fitted with a Sig Brace. These pistol features make the PSB easier for the civilian to own without a long wait for NFA paperwork. Otherwise, the PSB offers all the strengths of the original MCX Rattler, including rifle-caliber .300 AAC Blackout punch and the ever-familiar AR-15 operating system in a slim, ULTRA-COMPACT package that’s easy to deploy quickly. Built around Sig’s proven gas piston action, the MCX Rattler PSB doesn’t need a buffer tube, which contributes to its diminutive size. And with its 5.5" PDW barrel, the PSB is incredibly easy to squirrel away in a tight place - a backpack, briefcase, computer bag – until you need it. The three-position telescoping brace deploys in an instant, so you get your PSB into action FAST.
The full-size charging handle, safety selector, and mag release are all ambidextrous, so it’s easy to operate them in fast moving, high-pressure situations. The specially contoured and textured pistol grip gives your shooting hand excellent control. And the Sig Enhanced Trigger proves that a compact firearm doesn’t have to be a forced compromise with a poor trigger. Finally, the Sig Sauer MCX Rattler PSB’s adjustable gas block enables you to shoot both supersonic and - for use with a sound suppressor - subsonic ammo from it.
Purchase your Kel-Tec PMR-30 Semi-Automatic handgun from Target Sports USA, receive free shipping!

Other features

Uninterrupted full-length Picatinny top rail

Free-floating, hammer-forged carbon steel barrel with 1-5" rifling

M-LOK slots on handguard
USGI-pattern AR-15 magazines
Manufacturer Sig Sauer
Caliber300 AAC Blackout
ModelSIGMCX Rattler
ActionSemi Automatic
Barrel5 inch With PDW Upper
Weight7.4 lbs empty
Magazine Capacity30+1 Rounds


FREE Shipping on Bulk Ammo, Firearms & More!

Target Sports USA always offers free shipping on bulk ammo & firearms!

How Will My Order Ship?

Target Sports USA will ship your order via UPS Ground. Target Sports ships to the lower 48 states. We DO NOT ship to Alaska, Hawaii, Puerto Rico, APO's or P.O. Boxes.

Shipping Firearms
Handguns ship 2nd Day Air & long guns ship Ground. All firearms must be shipped to an FFL Dealer for NICS check & transfer. Please note: firearms transfers are subject to an additional fee set by the dealer.

Shipping Insurance

Target Sports USA offers shipping insurance on every order in order to ensure proper and safe delivery. The entire purchase price of the damages or lost merchandise is covered.
Due to the unique nature of the product we sell, we only accept returns and apply shipping insurance if the actual cartridges are damaged within transit. Superficial damage to packaging does not qualify for a return, insurance claim or discount.
Example: Dented corners on packaging, scratches or dents on ammo cans or cracks within plastic packaging would not qualify for a return and would not be covered under the shipping insurance.

Order Cancellation

You can cancel your order up until the pick slip is printed and your order is in process to be packed and shipped. After that time, we are unable to cancel your order.

If the order has shipped and a tracking number is available and you Refuse Delivery, a 10% restocking fee will be applied.

Incorrect Shipping Address

If you have supplied an incorrect shipping address & call prior to shipment, we can correct the address at no charge. If your order has been shipped, an address change fee per package will be added. If You Refuse Delivery, a 10% restocking fee will be applied.

Ammunition & Firearms Returns

Due to legal and safety regulations, ammunition sales are final and do not qualify for a return.

NON-Ammunition & Firearms Returns

(Ex: Gear, Clothing, Targets, etc.)

We offer returns or exchanges on clothing & gear items within 30 days of purchase.


   - Returned items must have tags still on and be returned in original product packaging
   - Returned items must have no visible signs of wear or use

   - A 10% re-stocking fee will be applied

   - You can return your product for a refund to the original payment method, less the restocking fee

   - Free exchanges for the same SKU

   - Returned items must have tags still on and be returned in original product packaging

   - Returned items must have no visible signs of wear or use


   - Discounted items are final sale and cannot be returned or exchanged


1 Customer Review(s)
5 Star
1  (100%)
4 Star
0  (0%)
3 Star
0  (0%)
2 Star
0  (0%)
1 Star
0  (0%)
Please login first to write a review.
Comments and Reviews on Sig Sauer MCX Rattler 300BLK PSB Pistol Carbon Steel
Combined with EOTECH Holographic Hybrid Sight II™ EXPS2-2 with G33.STS Magnifier.

Questions & Answers

Frequently Asked Questions
Question:More people are learning the lie about being able to buy guns online to your house is a good thing - Greg (03/21/2020)
Question:Can this be shipped to your home of does it require FFL? - Michael (10/22/2019)
Response:Hi Michael. All firearms must be shipped to an FFL to complete federal background check paperwork. Thank you for choosing

Similar Products


View more from Sig Sauer Ammuniton

View more in PISTOLS

Manufacturer Details

Sig Ammo For sale at Target Sports USA has the entire line of Sig Sauer Ammunition for sale online with free shipping on bulk ammo at cheap discount prices. Sig Sauer Ammunition is made in the United States in a brand new facility with brand new state of the art machines and offers a premium quality ammo products at low bargain sale prices. Sig Sauer Ammunition manufactures Handgun Ammo & Rifle ammunition and Sig Ammo is mostly known for their high quality self defense rounds called V-Crown and some of the Military Grade 9mm ammunition loads such as the M17 9mm Ammo. 

Target Sports USA has Sig Sauer Ammo For Sale in the following popular calibers: 

Sig Handgun Ammo                     Sig Rifle Ammo                     Sig Shotgun Ammo                     Sig Rimfire Ammo                    
Sig 9mm Ammo  Sig 223 Ammo 
Sig 45 ACP Ammo  Sig 308 Ammo 

Sig 380 Ammo  Sig 6.5 Creedmoor Ammo   
Sig 40 S&W Ammo  Sig 300 Blackout Ammo  
Sig 38 Special Ammo       
Sig 10mm AUTO Ammo       

Enjoy free shipping on Sig Sauer Ammo when you buy in bulk ammunition quantities at Target Sports USA.

Back To Top
HomeFIREARMS → Sig Sauer MCX Rattler 300BLK PSB Pistol Carbon Steel