The Remington Mammoth made by Snowpeak Airguns is a Pre Charge Pneumatic Bolt Action MultiShot or Single Shot Air Rifle that comes with a 3-9x40 Scope and a Dedicated Silencer. The Rifle is the Snowpeak M25W which is the wood version of the M25. The rifle is very well balanced and lighter thsn it looks. 
This version is .177calibre and has a Muzzle Velocity of up to 800 feet per second which equates to 12ft/lb knockdown power. 
Features include:
Manual Safety Catch
Two Stage Adjustable Trigger
Sculptured Ambidextrous Wood Stock
Intergrated Piccatinny Rails
Length 48 inches 
Weight 7.2lbs
250bar Max Fill Pressure
Air Capacity 250cc