WTS Benelli M1 Pistolgrip Stock, excellent condition, Includes sling plate, buttpad and round metal shim. $95.00 shipped
contact me at jeff at c-rums dot com
Both will fit however the buttstock will not match up to the receiver and would have to be notched for the trigger housing.
The forearm fits fine without and mods
Yes it applies to both the forearm and buttstock.
Just to confuse you more technically they fit but will not mate to the receiver correctly.
The M2 receiver is narrower than the M1 so the stock are not interchangeable from the M1 to M2 or vise versus. I hope that helps
Here are the dim's for the Nordic brand tubes you can also get them from the link below.
12 Gauge +02 +03 +04 +05 +06 +07 +08
Benelli M1, M2 6.19" 8.67" 10.44" 12.02" 14.39" 17.63" 20.28"
http://shop.nordiccomp.com/NC-Shotgun-Extension-Tubes-for-12ga-12GA-EXT.htm
I have had and used DMW tubes I prefer the Nordic Tubes. Use a bbl clamp too.
Good Luck