M.2 Compatibility question

[Jared_31]

Wanted to put together a build for myself because i got gifted a 960. Heres what i have so far i have all my peripherals and software the only main question i have is where to find a m.2 that is compatible with this motherboard.
Also any thoughts overall on improving it are appreciated.

PCPartPicker part list: https://pcpartpicker.com/list/6m9FHN
Price breakdown by merchant: https://pcpartpicker.com/list/6m9FHN/by_merchant/

CPU: Intel Core i5-6500 3.2GHz Quad-Core Processor ($204.99 @ Newegg)
Motherboard: Asus Z170-E ATX LGA1151 Motherboard ($135.98 @ Newegg)
Memory: Crucial Ballistix Sport LT 8GB (2 x 4GB) DDR4-2400 Memory ($49.99 @ Newegg)
Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive ($49.99 @ Newegg)
Video Card: EVGA GeForce GTX 960 2GB FTW ACX 2.0+ Video Card
Case: Thermaltake Versa H21 Window ATX Mid Tower Case ($50.98 @ Newegg)
Power Supply: EVGA 600B 600W 80+ Bronze Certified ATX Power Supply ($51.98 @ Newegg)
Total: $543.91
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2017-01-24 18:07 EST-0500

 

[Dark Lord of Tech]

PCPartPicker part list / Price breakdown by merchant

Storage: Crucial MX300 275GB M.2-2280 Solid State Drive ($89.88 @ OutletPC)
Total: $89.88
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2017-01-24 18:11 EST-0500

 

[Jared_31]

PCPartPicker part list / Price breakdown by merchant

Can you help me to understand why this is compatible? It says on the specs for this MB on Asus website
"1 x M.2 Socket 3 with M Key design, type 2242/2260/2280/22110 storage devices support"
The one you linked looks like its M+B....looking at the Hi-Res-Images the socket looks like it has nowhere for the B key to go
http://imgur.com/a/xSlX1

 

[Dark Lord of Tech]

Crucial MX300 275GB M.2-2280 Solid State Drive

"1 x M.2 Socket 3 with M Key design, type 2242/2260/2280/22110 storage devices support"

 

[Jared_31]

Crucial MX300 275GB M.2-2280 Solid State Drive

"1 x M.2 Socket 3 with M Key design, type 2242/2260/2280/22110 storage devices support"

Sorry if i seem ignorant i just know nothing about these things, Thanks again.

 

[Dark Lord of Tech]

Not a problem , glad to help.