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Reach Forward Extended Scope Mounts

Reach forward / extended scope mounts

Scope rings which allow eye relief to be increased or reduced are referred to as reach forward or extended mounts or sometimes cantilever scope mounts.  They are normally required when a particularly long or short rifle scope is being mounted or when a rifle has an unusually short receiver.  The extended ring is normally positioned in front of the loading port meaning the scope can be moved forward which increases eye relief.  Hawke optics range of products includes a range of compact rifle scopes as well as longer target style scopes and these type of scopes sometimes require extended scope mounts.  It is less common for the extended scope ring to be mounted at the rear of the loading port but this is sometimes required for shorter compact rifle scopes.

What is the best type of extended scope mount ?

Extended or reach forward scope mounts are available in 1 and 2 piece designs.  The 1 piece models are often called cantilever mounts and can be used on spring powered airguns or bolt action rifles with a raised single piece rail, this allows empty cartridge cases to be extracted without fouling the mount.  Normally for this type of rifle a 2 piece extended mount is a better option and save the need to buy a rail.

How do I know which model of extended scope mount to buy ?

Just like buying any scope mount you firstly need to know the diameter of your scopes body tube.  The most common sizes are 1” (25mm), 30mm and increasingly 34mm.  Then the height, reach forward rings are normally available in medium and high.  The medium option normally clears upto a 45mm lens diameter and the high versions normally upto 56mm.  Another aspect to consider is how much additional eye relief do you require ?  Normally an increase of 25mm (1”) is sufficient and models with this amount of offset are widely available.  Then are you mounting your scope to a dovetail or Picatinny rail?  There are models on the market for both types of rail and even for the wider than standard dovetails found on centrefire rifles such as the Tikka T3x,  CZ527 and CZ550 etc.

How do I know if I need a reach forward scope mount ?

Once you have purchased your rifle and scope you can hold your scope approximately where it needs to be to obtain a comfortable head position and a full field of view.  Then lay the rifle on its side and lay the scope next to it in the correct position.  You can then see if there is a section of dovetail or picatinny rail below the scope.  If there isn’t you will need an extended scope mount.

Which scopes need an extended scope mount ?

Most of the popular rifle scope manufacturers offer a wide range of models for different budgets and different types of shooting.  Hawke optics, Nikko Sterling and Leupold all offer a compact range of scopes as well as longer higher magnifications models.  These scopes with a longer than average tube length and therefore overall length and shorter than average models are the ones most likely to need a reach forward or reach back scope mount.

BlueBox1” (25mm) Diameter Body Tube Medium Range Scope Mounts For 11mm / 3/8″ dovetails up to 45mm lens diameter (on most rifles) 
           Includes removable arrestor pin.

Suitable for – Air Arms Anschutz Brocock Browning Cometa Crosman CZ Daystate Diana Evanix Falcon Feinwerkbau FX Gamo Hammerli Hatsan Impact Marlin Norica Remington RWS Stoeger SMK Theoben Umarex Walther Webley Weihrauch and many more Airguns and Rimfire Rifles A B C Dimensions Explained

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ET09C  OP43C
 ETO9C - Rimfire rifle scope rings  OP43C - Air rifle scope mount
2 PIECE MEDIUM EXTENDED 1 PIECE MEDIUM EXTENDED
A = 19mm A = 19mm
B = 21mm & 46mm C = 4.5mm B = 100mm C = 5.5mm
Weight 109g Weight 114g
Increases/reduces eye relief by 25mm

Ideal for Falcon / Titan precharged air rifles.
Also suits certain combination guns.
Includes removable arrestor pin 

Does not include arrestor pin
   

LiteGreenBox1” (25mm) Diameter Body Tube High Range 3/8″ Scope Mounts For 11mm dovetails / grooves up to 56mm lens diameter (on most rifles)
           Includes removable arrestor pin.

Suitable for – Air Arms Anschutz Brocock Browning Cometa Crosman Daystate Diana Edgun Falcon FX Gamo Gunpower Hammerli Hatsan Impact Magtech Norica Remington RWS Stoeger SMK Theoben Umarex Walther Weihrauch Webley Winchester and many other Airguns and Rimfire Rifles. A B C Dimensions Explained

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HETO42C 
 HETO 42 - Rimfire rifle scope rings
2 PIECE HIGH EXTENDED
A = 24mm
B = 21mm and 46mm C = 8.5mm
Weight 123g
Increases/reduces eye relief by 25mm
Includes removable arrestor pin
 

PinkBox30mm Diameter Body Tube Medium Range 3/8″ Scope Mounts For 11mm dovetails up to 44mm lens diameter (on most rifles) 
           Includes removable arrestor pin

Suitable for – Air Arms Anschutz Brocock Browning Cometa Crosman Daystate Diana Falcon FX Gamo Hammerli Hatsan Impact Norica Remington RWS Stoeger SMK Theoben Umarex Walther Weihrauch Webley plus many other Airguns and Rimfire Rifles. A B C Dimensions Explained

OP44 ETO37C 
OP 44 - Rimfire rifle scope mounts  ETO 37 - Rimfire rifle scope rings
1 PIECE MEDIUM EXTENDED  2 PIECE MEDIUM EXTENDED
A = 15mm  A = 15mm
B = 100mm C = 4mm  B = 21mm and 46mm C = 3mm
Weight 110g  Weight 98g
Ideal for certain combination guns
and Falcon / Titan air rifles.
Does not include arrestor pin		  Increases/reduces eye relief by 25mm
 Includes removable arrestor pin
   

LightBlueBox30mm Diameter Body Tube High Range 3/8″ Scope Mounts For 11mm dovetails / grooves up to 56mm lens diameter (on most rifles) 
           Includes removable arrestor pin.

Suitable for – Air Arms Airforce Anschutz Benjamin Brocock Browning Cometa CZ Crosman Daystate Diana Edgun Evanix Falcon FX Gamo Hammerli Hatsan Impact Magtec Marlin Norica Remington RWS Stoeger SMK Theoben Umarex Walther Winchester Webley Weihrauch and many more Airguns and Rimfire Rifles. A B C Dimensions Explained

HETO38C
 HETO 38C - Air rifle scope mount
2 PIECE HIGH EXTENDED
A = 21mm
B = 21mm and 46mm C = 6mm
Weight 121g
Increases/reduces eye relief by 25mm
Includes removable arrestor pin
 

PurpleBox 30mm Diameter Body Tube High Range Scope Rings Suitable for all Weaver / Picatinny rails. Includes square section hardened steel arrestor bolt. Up to 56mm lens diameter (on most rifles) A B C Dimensions Explained

HETO68C 
 HTO 68 - Picatinny / Weaver Rifle Scope Mounts
2 PIECE HIGH WEAVER / PICATINNY
EXTENDED 30mm
A = 21mm
B = 21mm and 46mm C = 6mm
Weight 138g
Includes square section hardened
steel arrestor bolt. Increases /
reduces eye relief by 25mm 

DarkGreenerBoxAR15 Extended Scope Ring. Suitable for all Weaver / Picatinny Rails upto 50mm lens diameter (on most rifles) A B C Dimensions Explained

AR15 MAXICLAMP (HOP77)
HOP 77 - Picatinny / Weaver Rifle Scope Mounts 
1 PIECE HIGH EXTENDED WEAVER / PICATINNY
A = 21mm
B = 120mm C = 6mm
Weight = 170g
Suitable for all AR type rifles and 30mm
rifle scopes upto 50mm lens diameter.
Includes an offset of 63mm (2.5″)
Full length Maxiclamp rail system
provides maximum clamping area.
 
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Height of Scope Mount Required

In each product catergory we state a maximum (upto) objective lens diameter dimension. Due to both rifle and scope designs varying this can only be used as a guide. If you are unsure that the height of the Sportsmatch scope mount you have chosen will be sufficient to clear your rifle scopes objective lens from the barrel of your rifle, we suggest (prior to purchase) you check. The way you calculate the clearance is by halving the overall outside diameter of your rifle scopes objective lens and then deducting half the rifle scopes body tube diameter. For scopes with a 1″ inch diameter body tube diameter this would mean deducting 12.7mm, 15mm for scopes with a 30mm diameter body tube and 17mm for 34mm scopes. This dimension then gives the figure comparible with the ‘A’ dimension that is shown below. The amount our ‘A’ dimension is greater than the figure you have calculated is the amount of clearance your scopes objective lens will be clear of your rifles barrel (dont forget to allow around 2mm for the scope covers). Calculating your rifle scopes clearance in this way does assume your dovetail or Picatinny rail is not raised above or below your rifles barrel. Please consider that rifles with grooved receivers such as some models of airgun and .22 rimfire rifle will mean the scope sits lower than a rifle with a raised dovetail or Picatinny base fitted. Something else to consider is that some rifles with a high or adjustable cheek pieces may require high or extra scope mounts so that your eye is in line with the rifle scope and your head is kept in an upright comfortable position.