Sig Sauer M400 SRP (Sight Ready Platform) 5.56 - 30rd SGRM400-16B-C-SRP

Overall Rating:
    (2) reviews

MSRP $999.99
Sale Price $939.95
Sale 6 % off

Brand: Sig Sauer
Item Number: SGRM400-16B-C-SRP
Status: Ships in 12-24 Months
Not Available In:   CA   CO   CT   DC   HI   MD   MA   NJ   NY  

Become a VIP Member to get free shipping on all orders!

Item not available for order

What is a Pre-Order? - Due to the nature of firearm manufacturing and supply and demand manufacturer's may not always be able to keep up with demand. If a firearm is not available in less than six months we allow you to "pre-order" it for $25. This reserves your place in line so that you can get your firearm as soon as it's available. The $25 pre-order fee is applied to the purchase price but is not refundable if you cancel your order. Pre-Orders are on a first come first serve basis which means that orders are fulfilled based on pre-order date. Pre-Order your firearm today!

Sig Sauer M400 SRP (Sight Ready Platform) 5.56 - 30rd: RM400-16B-C-SRP

For those looking for an optic-ready platform, the SIGM400 SRP removes the front sight tower and replaces it with an M1913  railed front gas block. This sight-ready platform allows the operator to mount any optic without worrying about the sight tower.  The gas block accepts all iron sights designed to work on the Mil-Spec Picatinny rail.

THE SIG M400 SERIES TACTICAL RIFLE, designed for use in law enforcement, military operations, or the sporting field as well as competitive shooting. The SIG M400 is a true AR platform tactical rifle. Provides unparalleled accuracy, with a 16"  chrome-lined and phosphate coated barrel that provides maximum durability and corrosion resistance. A 7075-T6 aircraft grade aluminum forged lower receiver adds to the durability and reliability.


  • Direct impingement gas operating system with rotating locking bolt
  • 5.56 x 45 mm NATO Chrome-lined barrels with phosphate finish
  • Accepts most M16 type magazines
  • M16A2 Type flash supressor

Additional Information

Specification Details
Item Number RM400-16B-C-SRP
Action Semi-Auto
Operating System Direct impingement
Caliber 5.56mm NATO
Overall Length 35.5"
Barrel Length 16.0"
Rifling 1 in 7"
Number of Grooves 6
Weight w/o Mag 6.5 lbs.
Magazine Capacity 30rd
Magazine Type Aluminum
Accessory Rail No


Click Here to View and Print the Sales Flyer

Product Reviews (2)

Write a Review

Overall Rating:

Customer Comments

Nashville, TN
Excellent Choice
Great product. Looks good, feels good. High quality. Very reliable and versatile.

Sig and Rockwell both came through
Rockwell called me when my spot came up on the waiting list for this Sig M400 optics ready, finished the purchase and it shipped the next business day. One thing to worry about with internet purchase is if the rifle was on display / had people handling it and scuffing it up. Rockwell treated me right sending me a Sig factory sealed box with a perfect M400 SRP only 3 weeks out of production in it. It means a LOT to know nobody was screwing around with my purchase. Thanks Rockwell. The Sig M400 SRP is an awesome deal... if you look at all the detail they put into it, there is no better deal for a base rifle to build whatever you want. M4 feed ramps, chromed, coated barrel, upper height railed gas block, built in wedge screw between upper and lower with a nice tight fit, mil spec tube, etc. there is no skimping... I know a couple people with M400s and they have never, ever had a misfeed or any sort of problem with any kind of ammo... so far it's the same with me, totally happy customer.