The installation of one of our 'Gunsmith Adapters' into the stcock of your rifle is a relatively straight forward process. This guide offers a number of suggestions & considerations to assist you complete this sucessfilly.
The rifle action needs to be removed from the stock to safely conduct this installation, and this is why we recommend customers to seek the help of a professional gunsmith if they are not comfortable with the process for their individual rifles.
The key areas for a successful installation are to ensure that all measurements are taken precisely.
Ensure that the adapter is:
- Centrally positioned on the centre line of the fore-stock
- Does not obstruct other fittings in or on the rifle
- Has sufficient space for the adapter to fit in that part of the stock
- Has sufficient space to accept any bedding medium used (Hollow stock)
- Does not come into contact with the barrel
Each rifle is different in this respect, and time spent assessing the correct placement is well spent.
In the photo below how the adapter is positioned slightly further back along the stock to account for the up-turn of the 'Schnabel' fore-end.
A 'Classic Gunsmith Adapter' has a circular design that will will generally be a little easier to install then a 'Universal Gunsmith Adapter', which has an eliptical design. The photos below show the differences in the design between them both.
Please remember that you only need the 'Universal Gunsmith adapter if you intended to use the Spartan '300' bipod, which needs the additional machined keyway in the range of 'Universal' adapers, to fold up.
Generally, though the further the bipod is located towards the muzzle, the great the stability in use is achieved, subject to the space available.
Customers often ask if the adapter should sit in front or behind the sling stud? Ultimately both options are suitable. If you are a shooter that makes use of your rifle sling for additional stability whilst prone then you may wish to locate the adapter in front of the sling stud. If there is a lot of tension on the sling could conflict with the bipod, if the adapter is positioned in behind the sling stud
Additional ‘Gunsmith Adapters' are also often installed by customers who require a mounting option closer to the balance point of the rifle, for use with the ‘Sentinel’ & 'Davros' products. The same considerations apply to these installations.
The rifle stock needs to be carefully masked up to protect it and firmly mounted upside down in a suitable vice or clamp to enable the stock to be accurately drilled.
For boring a hole in rifle stocks made of solid material a 19mm ‘Forstner’ bit should be used.
This is the most suitable bit for achieving a cleanly bored, flat bottomed, blind hole, which is essential for a solid stock. Ideally, the boring process should be undertaken using a pillar/pedestal type machine, so that the correct vertical angle of the bore is maintained throughout the process.
For rifle stocks manufactured hollow stocks (typically polymer material, but not exclusively) an 18mm hole saw works well and the slight flex of polymer hollow stocks allows the adapter to be firmly pressed into place, providing a tight fit in the stock. If the initial fitting is too tight, then a slight enlargement of the hole can be achieved using a small rotary power tool.
Carbon fibre stocks will require extra care when drilling to avoid chipping the resin or catching carbon thread. Good practice again would be to drill to 18mm and slightly enlarge & finish the hole will a rotary power tool, so the adapter snugly fits in place.
Once you are satisfied that you are drilling in an area of the rifle stock with suitable material & space to accept the installation of the adapter, it is simply a case of carefully boring a hole to the required depth. (If the stock is solid)
The adapter is 17mm (0.6”) deep in total, but not all of this needs to be installed into the stock. If you look at the photos below, you will see that the rim of the adapter sits sightly proud of the stock, requiring 12mm to be embedded into the stock itself.
We have also seen ‘Classic Gunsmith Adapters’ fitted lower then this (with care!) as there circular design is easier to seat.
As you can see in the next photo, the 'Universal Gunsmith Adapter' was installed very close to the upturn of the fore-stock, requiring the material that will lay under the lobe area of the design to be reworked to allow the adapter to be seated level.
The elliptical shape & need to hold the ‘300’ bipod when folded can make make the installation challenging in some rifle stocks. However for a new or custom build this is a is still very a good option if its required, as shown in the photos below.
Once the hole has been bored into the stock the preparation & bonding process can take place.
The ‘Gunsmith Adapter’ can then be fitted in place & alinged correctly to ensure the bipod is able to traverse correctly.
For Javelin bipods there is an additionally machined cut within the socket of the adapter enabling it to be fitted in reverse (Fixed position.)
For the ‘Classic Gunsmith Adapter this ‘Fixed’ feature can be installed so that the ‘Cant Block’ nut / lever is either towards the shooter or away , depending on preference. Simply rotate the adapter 180 degrees in the stock before bonding in place.
In the two photos below you can see how the to machined cut outs are orientated in relation to the longitudinal axis of the rifle stock. To ensure that there is equal traverse when the bipod is fitted both left and right.
The cut outs must lay parallel to the to the stock in this orientation.
The decision on whether you would prefer the traverse on the left or right side is personal preference. The only functional difference this make is to the accessory to the cant lock facility on the bipod body.
Depending If you prefer the cant lock nut / lever to face you with the bipod able to traverse or with it in the fixed position, this can be achieved by installing the Gunsmith Adapter in an 180 degree orientation from each other.
For Spartan ‘300’ bipod users , the the key way of the 'Universal Gunsmith Adapter' must face forwards towards the muzzle, to enable the bipod to fold up facing front, and be held in position as shown in the photo below.
For Solid stocks the bored hole simple needs to be keyed & cleaned with a suitable solvent degreaser.
The adapter should also be 'keyed' & cleaned. Once done it can then simply be installed & bonded in place using a small amount of the suitable epoxy
We favour using ‘Devcon 10110 Type A Plastic -Steel Putty’. (Other makes are available!) This is a two part epoxy containing sintered metal. We have found this to be extremely reliable & durable, and being a putty, it is a little more forgiving when you require to work or shape it slightly as it cures.
For Hollow stocks a little more work will be required, as the adapter will need to rely upon the additional support of the bedding material to hold it in position and manage the energy of the rifle in use.
Often these stocks are manufactured with a number of hollows or wells, divided by a series of cross braces. These hollows are an excellent place to use for fitting the adapter into. The cross braces form perfect bulkheads to contain the epoxy and surround the adapter.
Ensure that the internal surfaces are keyed, cleaned & degreased. Ensure that any areas that you don’t want to get epoxy on are masked up.
Any joints between the fore-stock & the stock should be masked to prevent the resin creeping and from bonding the two together.
‘Devcon’ is better in this respect then other more viscous epoxy resins. You may be required to make a small former or ‘bulkhead’ to contain the epoxy within the stock. Using stiff plastic cut to shape works well for this. And plumbers putty etc can also be moulded for trips corners & shapes.
Ensure that areas that you don’t want the epoxy to stick to that can’t be masked are coated with a thin layer of wax. (Neutral coloured wax shoe polish works well for this.)
Press the adapter into place, and consider using masking tape or similar to secure it in position, so that it isn't on inadvertently dislodged in the bonding process.
Mix the epoxy according to the manufacturers instructions, and then fill the area around the adapter, ensuring that it if fully surrounds the adapter from the base to the stock to the top of the adapter. Ensure that the resin wont reach the rifle barrel.
Wait for the epoxy to cure, remove the making material, clean & reassemble the action to the rifle & check zero.
If you require any additional information please submit a ticket through our helpdesk.
The video links below outline the processes of installing a gunsmith adapter into a solid wood stock.