It is possible to use either the Javelin-Lite, Javelin -Original or Javelin-Pro Hunt with your HW100 rifle.
There are a couple of fitting options for you to consider which are specific to the HW100
1. The stock of the HW100 is surprisingly thin at this mounting point, and care needs to be taken not to put too much pressure or leverage on it or there is a risk of cracking it.
We have been told that Weihrauch does not recommend the installation of bipod studs to replace the existing stock bolt, although clearly many do.
Our existing 'Universal Rifle Adapter' adapters use a 5mm metric screw, (directly into the female thread/nut within the rifle stock)
It is possible to fit the 'Universal Rifle Adapter' directly the 'HW100' rifle stock in a couple of ways.
In can be attached directly to the front of the stock mounting point. This is located on the underside of the air cylinder, part of the barrel band, using the front mounting bolt hole for the rifle stock.
The mounting bolts for the HW100 are 6mm metric, so a suitable 6mm countersunk screw needs to be obtained as a replacement for the standard 5mm screw.
The hole in the base of the adapter needs to be enlarged with a 6mm drill bit
The existing hole for the stock bolt is rebated into the stock, and the wood is quite thin.
It may be possible to 'bolster' & support this section of the stock by fabricating a small bushing to fill the recessed hole that would normally accept the bolt head of the standard stock bolt. As standard, the rifle will normally have a thick washer under the original fitting screw.
The 6mm screw & simply fits through the adapter & rubber plate and bolted to the stock in the normal way.
Insert' into your stock, specifically to accept a screw for the 'Universal Rifle Adapter' in the normal way.
Like the 'Gunsmith' adapters below, the adapter needs to be placed where there is sufficient material to support it, or additional support needs to be added to strengthen it.
It should be noted that this option will not work successfully with the Spartan '300' bipod as the head of the screw within the adapter socket sits slightly higher than the standard 5 mm screw, which inhibits. the correct functioning of the bipod.
If use with the Spartan '300' is required then either one of the following mounting options can be considered.
2. Another option would be to fit a suitable 'Stock Insert' into the rifle stock to provide a structurally sound mounting point. We would suggest that this is located at a position where the wood material of the stock is thickest.
A small hole is drilled into the rifle stock just large enough to accept the 'Stud Insert', which is then boded in place to using a good quality epoxy resin.
The standard 5mm screw can then be used in the adapter in the normal way.
The same considerations for 'bolstering' the mounting point for the 'Stock Insert' apply as for the previous fitting option.
3. This option involves using either a 'Classic Gunsmith Adapter' or 'Universal Gunsmith Adapter'.
In the example below, we have used a 'Universal Gunsmith Adapter' for this purpose. However, for 'Javelin' bipod owners, we'd recommend the 'Classic Gunsmith Adapter'. Its slightly easier to fit, due to its completely circular design, whereas the 'Universal Gunsmith Adapter' is elliptical (as in the photos below.)
The same general considerations for a successful installation apply to the HW100 stock as any other 'Gunsmith Adapter' installation. All measurements must be taken accurately.
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 in that part of the stock
- Has sufficient space to accept any bedding material 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 further back along with the stock, so that they are contained within the hollow of the stock, behind the stock mountain bolt.
The position takes advantage of the wall at the front of the hollow section to strengthen & support the 'Gunsmith Adapter' when installed into a body of epoxy resin.
Generally, though the further the bipod is located towards the muzzle, the great the stability in use is achieved, subject to the space available.
The rifle stock needs to be carefully masked up to protect it and firmly mounted upside down in a suitable vice to enable the stock to be accurately drilled.
For boring a hole in rifle stocks made of solid material a 19mm bit or hole saw should be used. Ideally, the boring process should be undertaken using a pillar/pedestal type machine, so that the correct angle of the bore is maintained throughout the process.
If the initial fitting is too tight, then a slight enlargement of the hole can be achieved using a small rotary power tool.
The adapter is 17mm (0.6”) deep in total, but not all of this needs to be installed into the stock, the rim of the adapter sits sightly proud of the stock, with approximately 12mm to be embedded into the stock itself.
Once the hole has been bored into the stock the preparation & bonding process can take place.
The ‘Gunsmith Adapter’ can be fitted in place & alined 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.
For ‘300’ Bipod users , the cut out for the folded bipod must face forwards towards the muzzle, as shown in the photo below.
It is a good idea to tape the adapter in place once aligned so that it cannot be accidentally jogged during the bonding process.
Not all of the hollow in the stock needs to be filled with epoxy resign, just a small area around the diameter of the adapter so that it is sufficiently bonded in place and supported from the loads imposed when the rifle is used.
Adjacent to the rear face of the adapter a small bulkhead or former can be fabricated to prevent the epoxy from migrating along the stock.
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.
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 wit 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 than other more viscous epoxy resins. You may be required to make a small former or ‘bulkhead’ to contain the epoxy within the stock.
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.)
Mix the epoxy according to the manufacturer's 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 won't reach the underside of air cylinder.
Wait for the epoxy to cure, remove the making material, clean & reassemble the action to the rifle & check zero.