Bushmaster M17S Customization By K&M Aerospace Review

by Gunguy

Base rifle: Bushmaster M17S, gas operated, short-stroke gas piston, 5.56×45 NATO bullpup rifle.

Factory Specifications:

Weight: 8.2 lb (3.7 kg)
Length: 30 in (760 mm)
Barrel length: 21.5 in (550 mm)

Rifle Customization performed by Ken from K&M Aerospace
List of custom work performed on the rifle with pricing:

Standard mod with the slot hole configuration+ charging handle+ upper rail, lower rail and paint – $350
2x 4.12″ side rail – $80
Install side rails – $30
Cheek rest – $35 – very practical and simple mod that allows for a comfortable and consistent cheek weld thus speeding up target acquisition.
Trigger fix – $125 – Probably the best single modification this rifle has seen. It drastically improved the smoothness of the pull and eliminated most of the creep and grittiness that plagued the original setup. Trigger pull has decreased from almost 10 lbs. to an average 6 lbs. 4 oz. on Lyman digital trigger pull gauge. This single mod has completely changed the feel of the rifle.
Gas piston assembly cleaning – $30
Shipping – $25
Total – $675

Overall I have to say that all work performed is of outstanding quality and value and completely changes the look and feel of the rifle. Having previously dealt with a few local gunsmiths that almost ruined rifle’s upper receiver trying to install side rails alone, all my expectations were exceeded by how clean and professional Ken’s work is. I highly recommend his services to anybody looking to add that custom touch to their rifle. Keep in mind that not all services or modifications are listed on Ken’s website, so it is best to contact him directly with inquiries related to any custom work.

Email: ken.kmaerospace at gmail.com
Phone: 480-406-0538
K&M Aerospace
2040 S. Alma School Rd. Ste 1
Chandler, AZ 85286-0987

Rifle in the after photos is accessorized with the following:


Vortex Viper PST Rifle Scope 30mm Tube 1-4x 24mm 2/10 MIL Adjustments Illuminated TMCQ Reticle Matte

Scope Mount:

Vortex Optics ADR Cantilever Mount w/2in Offset for 30mm Scope Tube ADR-30

Scope Accessories:

Butler Creek Flip-Up Rifle Scope Cover #2A Objective (Front)

Butler Creek Flip-Up Rifle Scope Cover #14 Eyepiece (Rear)

Back Up Iron Sights (BUIS):

GG&G Spring Flip Up Front Sight for Dovetails, Tritium Sight Post

GG&G Spring Actuated A2 Rear Peep Spring Flip Up Sight w/ Trijicon Tritium A2 Aperture

Flashlight and Mount:

Olight M20S Warrior Premium R5 Black Tactical Flashlight with Side Switch 320 lumens – by default, this flashlight comes with an orange peel reflector which diffuses and shortens the throw of emitted light beam. The orange peel reflector has been changed to the smooth type for maximum throw and low dispersion.
OFF SET TACTICAL Weapon Mount For Olight M20 /M21/M30


Accu-Shot Atlas Bipod (V8.1) (Clamp On) (BT10-LW17)

Stock Accessories:

MagPul MS2 Multi-Mission Single Point / 2 Point Sling Nylon

MagPul RSA Rail Mount Sling Adapter Loop AR-15 Steel Matte

Magpul Rail Cover – Great item to cover unused portions of picatinny rail and for indexing of location for attachments and accessories.
Picatinny Rail Spare CR-2032 Battery Holder for Scope










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