My reading of the consultation is that the sale or possession of engineering equipment is NOT going to be controlled, but their ready availability makes the existing law an ass. In short, you don't need specialist equipment to modify firearms (as any roadside AK47 maker in the Khyber Pass region would tell you).
The consultation states:
6.40 It might be thought that such an offence would criminalise everyone who is in possession of any drill, vice or other common tools. This is not the case, however. An individual would only commit our proposed offence if the prosecution proves he or she was in possession of an article capable of being used in the unlawful conversion of an imitation firearm and he or she had the intention to use it for that purpose.
6.41 For example, section 6 of the Fraud Act 2006 potentially criminalises anyone in possession of a pen and paper. The reason it does not do so is that it requires an intention to use those articles for an unlawful purpose. The Court of Appeal has confirmed that requiring the prosecution to prove intention ensures that those who are in innocent possession are not criminalised.17 This same interpretation would apply to our proposed offence.
6.42 The requisite intention would be capable of being proved if, for example, an individual was in possession of articles and instructions on how to convert imitation firearms into live firearms.
6.43 Such an offence, therefore, would ensure that only those who possess tools and equipment with the intention of using them unlawfully to convert imitation firearms into live firearms commit an offence. This proposal would also ensure that an individual who only possesses such tools for carrying out maintenance on his or her home would not commit an offence.
I think the real issue is making sure it is recognised that the combination of being a model engineer and having an interest in firearms is not seen as prima facie evidence of an intent to carry out modifications. For example, I have some American magazines that contain some articles on gunsmithing; I have no idea if they would help me convert a replica pistol and I would be aghast if the combination of these and my lathe got me into trouble.
What would be very useful would be for someone who has the ear of a sympathetic MP asking them to gain suitable and public reassurances that this legislation will not be used to limit the legitimate practice of model engineering or the collecting of replica firearms in isolation or together.
It would also be sensible to seek clarification that that making non-functional replica weapons must not been treated as an offence and that official guidance on how to ensure such replicas cannot be readily converted would be welcomed.